Yes. There are 2 reasons to buy aftermarket 2nd gen frame, IMHO. 1) bling. I appreciate that, as fine a reason as there is, no knocks here. 2) racing. If the answer is 3) great street car, it's relatively easy to make a 2nd gen a great street car with a stock frame.
While I was at SEMA I talked to a lot of folks out there. Engineering types and drivers. These seem to be the favorites at this time.
http://artmorrison.com/camaro.php
Art Morrison uses vette parts, so replacement parts are out there. I've spoken with Matt at AME and would not hesitate to use their stuff.
http://www.detroitspeed.com/productp...rame2ndgen.htm
Considered by most to be the class of the lot. Mark Steilow uses their stuff for a reason. Mostly proprietary parts, but very well done by all accounts, and priced accordingly.
http://www.heidts.com/
By all accounts their latest stuff is very good. I spoke with Mary and Dave Pozzi at SEMA about heidt's car, which Mary raced at a suspension challenge super chevy magazine did. She thought the Heidts stuff performed very well. I dare say surprisingly well.
I can't think of any other 2nd gen SF I'd buy.
If stock frame is the eventual choice, perhaps call Keith
http://www.customworksproducts.com/ or Mark at
http://www.scandc.com/suspensions.htm
Hold a gun to my head today I'm going AME. I like OE parts a lot. All 3 options are better than my driving ability.