Recommended engine?

Retson said

I wanna do something bigger than a 360.

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Stroker kit 408, from Scat. All Forged Parts

http://www.summitracing.com/parts/sca-1-48033/overview/make/dodge

Stroker kit 408, from Eagle. All Forged Parts

http://www.summitracing.com/parts/esp-20102030/overview/make/chrysler

Besides a regrind of the cam you just need a good intake (e.g. RPM Air Gap) and porting your heads (replace them with a set of RHS and some clean up).