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I just finished a 394" 383 with B1 origional heads that were as cast except for the exhaust ports and it made 782hp at 8200rpm with a 750cfm 4150 holley with an adapter to the dominator B1 Manifold. The manifold probably hurt this engine power wise because its HUGE for the cubic inches. I would imaging a 451-470 would make a fairly decent amount more power. The engine just made a super stock 68 Cuda go 9.45 @ 141.

That wouldn't be a Viper yellow 1969 SS cuda would it

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)