The frame rail reinforcing plate for dual exhaust mentioned above is found on the driver side rail, behind the tire. Not all LM1s had dual exhaust.
Here is the 69 model specific info from the CRG site: http://camaros.org/diffs69.shtml
There is also an LM1 dedicated website, http://www.69lm1.com/faq.htm
Some other interesting info online includes a 69 Camaro specification package http://www.scribd.com/doc/26771252/6...o-Spec-Package
and the 69 Assembly Instruction Manual (AIM) http://www.scribd.com/doc/32913817/69-Camaro-AIM
If you have a good internet connection, both of those PDFs have a lot of important info you might want/need.
Regarding some other answers/observations:
All models had the "Camaro" script behind the front wheels, except
rally sport cars, which had a "rally-sport" emblem in that location. The reason you see a lot of cars without the "Camaro" is because when replacing fenders and repainting, it is a pain to get the nuts on the back of the emblem, or they have been left off for a "cleaner" look.
The chrome accents on the rear quarter gills were part of the Z21 Style Trim package, as noted, and were also installed on SS cars (part of the Z27 RPO, called "simulated rear fender louvers". So, these are not present on all cars.
The car looks great, so what I am typing that follows are just little nitpicky things that are not "correct" for the car if it is an original LM1. Not finding fault, just informing...
- Obviously the SS badges are not correct, but you are lucky that the SS emblems under the fender "Camaro" script were not installed. If you wanted to make it more correct, you could just replace the grille and tailpanel badges with the correct blue bowtie emblems. Oh, and the steering wheel shroud emblem, too.
- The car is missing the "Camaro by Chevrolet" emblem from the header panel (the part between the grille and hood) and from the deck lid (a factory D80 spoiler car would have had the emblem repositioned in the alternate location on the passenger side of the lid, just ahead of the spoiler; dealer installed spoiler cars often had this emblem left off, as do many guys who install the spoiler at some point.
- the black grille is incorrect, should be silver http://camaros.org/exterior.shtml#1969Grille
- the rally stripes are incorrect in several ways. First, they were only available as part of RPO Z28, Z11 (the Indy Pace Car replicas), and Z10 ( http://camaros.org/69pacer.shtml#Z10
). Also, assuming the car is not a super early build, it looks like the rear stripes are spaced like the 67-68 stripes. Regardless, they look nice and getting rid of them would require a lot of effort and money, so I would not bother.
- unless the car would be a very late build for an LM1, the hood is not "correct" (LM1 ordering ended in Dec 68 from what I recall, and the ZL2 special ducted hood entered production in Jan 69; I assume the LM1 site or the CRG would know if any LM1 cars were produced with the ZL2 hood). Again, it is a very common addition to a 67-69 Camaro, and it looks good on your car. If it does not have all the OE style components to make it "functional" (flapper door, solenoid and harnesses/linkage to open it when the throttle is wide open, it at least lets hot underhood air out. If you don't care about correct, you can easily get an aluminum cake pan of the correct diameter and modify it to fit on the carb to seal the air cleaner to the cowl hood opening, just to get cooler air all the time.
Like I said, the car looks really nice, and is a color that is not common but appears to be well done on your car, so please do not stress the "incorrect" things I pointed out. Good luck and welcome to TC!
P.S. My 69 vert started life as an L6 car, but it now has a 396 and a 5-speed; once it is released from paint jail, it will be gray (originally a Dover White car) with black rally stripes that are my and my painters interpretation of the 5th generation rally stripes. Because it now has a 396, we are blacking out the tailpanel around the taillights like an original SS396 car, and it has a black grille because I like the look better than the silver, especially with a metallic gray paint color. And, I am using the blue bowtie emblems in the grille and tail, but I put the 396 badges in front of the marker lights. Oh, and it has a GM cowl hood. So mine will be more bastardized than yours is, but it is going to be the way I want it. I may get some "experts" giving me grief about the combo, but I hope that most will just think it looks cool.