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How much spray do you think a forged piston stock rod and crank 383 could take?
THe weak link in that combination is the Rod, It will tansfer ANY detonation right to the block, your other weak link, I would say 175hp (.073 square jetted) should live fine, you might also get away with 225 or more....BUT you need to run good fuel, and be conservative on the timing, Keep the motor out of detonation at all costs. I had a Stock block, stock crank 446, It had a JE piston and an alum rod, Even with stock caps, i sprayed close to 300 and made over 100 passes. The stock caps had massive cap walk, but that was about it. Pushed my then 3600+ car to 9teens 9.20s pretty consistently. Get used to reading plugs and looking for the signs of detonation on them 
....BAD A$$ STREET CAR.....
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