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
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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