If its a gen 4 block (2 piece main seals) then use 781 oval port heads. you cannot use gen 4 heads on the Gen5 one piece seal blocks (tbi motors). Peanut heads make some tq but the ovals will blow them away in both HP/tq. If you run cast pistons keep it under 5500 rpm. Go forged for towing if you can they will be less likely to melt down pulling long hills. 4 bolt blocks are great but 2 bolt with arp will hold 600plus HP without power adders, Trans brakes, and 6500 rpm launches. if your having to rebuild it I would strongly urge looking at a 496 Stroker kit. Man what happened to the 401? Stay around 9:1 compression BBC are detonation prone w iron heads. Also dont run any rectangle port head, your intake.velocity will suck until 3k then will come on like gangbusters. Great for a 2800 lb track car, chevelle w 4.56 gears and 3500 stall.
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