Re: help with ralley wheel decode
FW is a fairly common 15x7 used on early to mid-70s Montes, Chevelles, etc. You are right on the backspacing.
I have not been keeping up with swap meet or ebay pricing, but there are a lot more FWs out there than the codes for 1st gen Z28s. They are generally the rally of choice for 1st gen guys looking for a 15 inch GM rally with a decent BS and reasonable pricing. If they were cherry and had good caps and rings, they might bring $100 a wheel, vs the much more expensive AD or YH 69 Z rims (the 67-68 Z used a 15x6 size).
From what I recall, guys are running sizes like 235 60 15 on all four corners with that rim width, but you should check through the stickies at the top of the wheel and tire forum, because other sizes might fit with the more rounded wheel openings of the 67-68 cars.
Also, try searching with something like "monte rally" if you don't find what you need on the stickies, or if none of the 67-68 guys chime in here.
I like a more narrow tire up front, but that is me. I run 215 65 15s on my Foose wheels with 4.75 BS, and they fit perfect and look good with the 245 60 15s on the rear.
If you go to TireRack.com , and plug in any of those sizes and look at the BFG Radial T/A or Dunlops, then hit the "other sizes or specs tab", you can see all the available sizes for a given tire line, and recommended rim width, resulting section width, etc.
You won't find many lower profile tires in the 15 inch size, if that is the look you are shooting for, but you'll find a decent selection of 70, 65, and 60 series tires.
Good luck, and post back if you need more info.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!