I built one for a '68 400 GTO. Took the stock YS and put a Butler forged rotating assembly in it with 15 cc dish pistons to make a 10.0 CR 461 with the stock iron heads that I street ported and used the OF HR cam with RA exhaust manifolds and stock intake/carb. Open the hood and it looks factory stock but works well.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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