[Root2812]

I have a stock frame with MII suspension on my 1950 3100. I don't know about the trans am exhaust manifold you have but I used 2002 corvette exhaust manifolds and they worked. I only had to clearance my boxing plates. The very corner of the flange rubbed the boxing plate so a small hole fixed that without hurting strength. I say mock up your engine centered and try the ones you have and if they don't work then try another set.

If you are in the twin cities I'll even let you test fit my vette manifolds and a set of ls2 GTO manifold I have laying around.