300whp with stock internals should be fine, but I really don't know much about the b17 bottom ends. There weren't many made so there isn't much info kicking around the net.


For 300whp ish you're looking at max new rods and pistons. I dunno, with an engine like the b17 I'd be tempted to throw a small, fast spooling turbo on there and have fun with it that way instead of pushing huge power.