To put it into perspective, a bone stock 2013 manual 5.0 makes around 390 ish rwhp.. (Just an average number) a 2013 boss 302 makes about 405 rwhp (again just an average number) so that's 10-15 hp over a std gt car... Although the entire power band is different but you get the point. Get your heads ported there will be much better gains.
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