thoughts on porting stock heads

I have a friend that said he could port my heads for me. he owns a machine shop and said he would do it on the side for $350. my question is, I am looking to try and make about 375 or so at the crank. will the stock heads ported be able to support this? this would be with higher compression pistons and all the other things ie cam, intake, carb, headers, and ignition.
Author: admin