I don't want to start a "you can't run above 9.x on pump gas" argument. But in general, if you happen to be looking in the high 8 to low 9:1 compression ratio, the 4's (with proper milling to dial them in) are good for a 400 and the 8's are good for a 455.
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469 (455 + .060") with the Edelbrock RAIV cam, Ported 6X-8 heads with 1.77" exhaust valves, 100 cc's, "0" decked block for 9.3:1 static CR, Eagle 1.65:1 roller rockers, Edelbrock RPM manifold and Edelbrock 750 carb., 1.75" x 3.0" Hedman Headers, 2.5" flowmaster exhaust system with "H" pipe and Dynamax super turbo mufflers. 200-4R with a Continental converter, 3.07:1 12 Bolt Saf-T-Trac
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