My son and I are currently putting together an 86 T/A with a 455 & TH400. We are using the IA mounts, "factory d-port headers". With a Edelbrock Performer intake and a Demon carb there is about 1/4" clearance between the top of the bowl vent and the bottom of the hood. Probably going to have to install a cowl hood on this thing. Sucks because we already painted the car with a brand new factory T/A hood on it. We are using Spohn's torque arm and TH400 crossmember (Excellent product, perfect fit). The d-port manifolds fit perfect also. We fabricated a y-pipe out of 2 1/2" U & J Bends dumping into a flowmaster y-collector. From there it will enter into a catalytic converter located in the stock position. We have a Flowmaster 3" system (The one with dual 3" tailpipes with stainless tips)to complete the exhaust. As far as power steering compatability, use the late model Chevy pump mounted on the Pontiac brackets. It looks like we are going to use Rodney Red's serpentine setup as the factory brackets locate the alternator too high (hood clearance again). I'll post some pics of our progress. Good Luck.
Erik
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1964 GTO
501, Edelbrock Heads NA, 3460 lbs.
9.76 @ 137mph
1971 Trans Am Lucy Blue, 11.56 @ 115
1966 LeMans. 6.0L LS single turbo, 8.85 @155 mph
1976 Trans Am twin turbo 462, SD Edelbrock heads 8.03@171 mph
2009 G8 GT
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