Weight? Rear gears?
Th cam and intake and maybe even the 340 cfm heads killing the bottom end?
My 78 TA with my 0.030 over 2 bolt 455 320 CFM E heads and a 239/247 HFT Torker II and an 850 when it weighs 3750 with light wheels in good air can run high 10s @124. 1.6 60 ft. Toss rear DOTs and heavier snowflakes on all 4 corners runs 11.50s at about 119 even with the air cleaner on it . But that was with 4.11s and a Continetal convertor about 3500 stall.
I will say with my previous SR cam motor when we pulled the air cleaner element out after tuning for the air cleaner it freaking lean popped out the open Shaker that night! So it can make a difference. Even a 14x4" air cleaner on the 500" IA Camaro killed it 0.3 seconds!
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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