Go for the 428. When I swapped a 400 shortblock under my RAIV heads HO intake same cam same headers for an NMCA class vs the old 455 short block it felt like a dog with the same 3.42 rear gears. Took 4.10s and a looser convertor to feel the same. The 428 would put you in the middle and I think is the perfect street/strip motor.
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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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