So many questions. The options are only restrained by your budget! What kind of intake does the car have? Does it have headers? What kind of transmission do you have?
When you say you want to help the car run better and get more horsepower, I assume that it doesn't sound like it isn't running properly, and just may need a tune up and some adjustments. Describe what the car is doing that you don't like, or that you want it to do better to help us better understand the situation. Pictures of under the hood would definitely help.
Is the car running fine, and you just want more hp? Because that's a whole different scenario.
What are your plans for the car? (street, strip, highway, cruising, car shows)
Tuning a car is a process, and the team here can help you achieve your goals, but we need to know what you want to do and what your budget is. I will happily spend your money for you and recommend things you don't need!
With the limited information given, and assuming you are not taking the motor out of the car and sending it to the machine shop (383!), your biggest bang for the buck is stuff that is going to help the car breath better. I.E intake and exhaust.
I ask because I have a stock 69 SS350 with a 4 speed that pulls hard in every gear. Could it use more hp? sure, but I love it just the way it is! But I have driven a big block car that couldn't get out of its own way, because everything under the hood was wrong for that motor (intake, cam, gearing, etc). So help us help you spend your money!
for some reason I cant post pics
so here is a link to the car I bought
.ebay .com/itm/1969-Chevrolet-Camaro-SS-350-EFI-AUTO-PS-PDB-TACH-GAUGES/193172056454?ssPageName=STRK%3AMEBIDX%3AIT&_trksid =p2060353.m1438.l2649
intake - the listing when I bought the car said performance intake
headers - no
exhaust - Pypes Performance Exhaust SGF60S
transmission - automatic - the one that has 3-2-1 in the shifter
the car does run good has a oil leek but its in the shop now getting that fixed they are also going to tune the car as the shop said it could use that - trusted classic car shop also replacing the starter
when I said I wanted the car to run better and get more power - i meant here that if there is anything you can do to help it ruin better more like as modern car - and Yes I would like to add more power with out doing any major modifications
plans for the car
weekend driver - would like to take it on the high way, causing and to go to car shows - I dont expect to win anything just attend
budget is open as I will do things over time - I do not want to do an engineerings swap or take it out of the car
intake - If the one in the pics is more standard I would like to add this to the car - does anyone know any I should look at getting