I just recently built a 455 that made 507/571 HP and TQ with the stock Q-jet on the stock intake manifold, with stock exhaust manifolds in place, using a similar 239/243 @ .050 hydraulic roller cam.
I'd say the sniper is more than capable and if you want to go the fuel injection route then I certainly wouldn't hesitate trying the spread bore sniper on an engine like this. Long as you have the fuel system to support it.
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