New 68 Firebird Project

[AlohaFast]

Picked up a 2-owner 68 Firebird 400 coupe in decent shape. Probably 1 of 2 or 3 remaining 68's here in Hawaii. Guy I bought if from did all the work, but lost interest/money a few years back so it survived with the cheapest parts possible since then. Usual rust items to be worked, etc. It's not a real 400 but a clone with all the right pieces. Motor is a .030 over Pontiac 400 rebuilt about 9 years ago. Has forged TRW 10.75-1 pistons, Crower Streetbeast Cam, roller rockers, Edelbrock Carb and Performer RPM manifold, Mallory ignition, headers, etc. Has a Tremec 5-speed with 3.36 posi. Hey, it's a good starting point.
To be honest, with all those mods, it doesn't pull that well. Seems to run OK but sure expected more power. Thoughts? Also, how can determine which version of Tremec 5-speed it has?

Thanx

Pete