I think a mid to low 11 sec 1/4 is doable. My 70 gto had a 455,,#62 heads ported to to 250 cfm,t2 intake,800 dp holley,ra4 sized cam with rhoads,3.73 rear with 10" jim hand converter,thm400.. Full exhaust. Rest of the car was all stock. .not stripped..PS,PDB. 3950+ lb with me in it Ran 11.7 at 115mph (7.4 1/8th mile) and actually was a mild combo. Definitely not as much as your engine.
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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