Fuel management, and cooling are your best friends. You should def spend time on head work. You can make over 400 whp on stock cams...It's been done a billion times. And depending on the shape of the motor you could prolly get away with it ona stock bottom end but I wouldnt push my luck if I were you
. Just do some looking around, find someone with a similar set up that your lookin for then ask em questions!. In most case's people are pretty humble about that and will help you out with trouble shooting and all that crap.