72 engine rebuild

[carpoor]

I agree, 375HP from a 307 would be a tall order. You can get a streetable 400 HP from a 350 without even trying. It will look similar to the 307 as well. Just make sure you match all the parts - and don't neglect the transmission and rear differential. You can have a great engine, but it won't perform worth a crap if it has a stock transmission/converter and highway gears. Just my $0.10