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what kinda horsepower can a 400 block hold up to max. race and street. if it was a all out race motor it would run a few trips down the strip every other weekend. if it goes on the street. it will be driven every other weekend. just curious.
it will have forced induction and will have aluminum caps with girdle.

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My 1976 400 block 518 C.I. N/A motor makes 720 hp on pump gas, 10:29 to 1 comp. ratio. I replaced the main caps with a set of the Mopar brand ductile iron main caps, no fill, all water jackets stock 4 years of racing, 300 to 400 passes total, mostly 1/8 mile, and around 1500 street miles. The car weighs 3400 lbs with me in it and has run a best of 10:34 at 128.6 MPH running out of fuel the last 300 ft. in the 1/4 I didn't have a big enough fuel system for the motor I do now, back to the 1/4 mile track for more tuning BTW, I don't like the designs of the aftermarket girdles that I have seen for BB Mopars and I don't like filler in the cylinder blocks To each thier own BTW, how much boost and how big is the motor going to be?