500hp can be done- find a dyno proven build up- follow it,I'm building 450+hp for the street on a small chevy and a small budget around 3500-4000,small domes,zero quench,good heads, hydrolic roller,good ign.a little racing fuel? go to classic talk and go to engine build ups-looking for build up. the local shop will do just fine if you tell them what you need done!torgue plate, equiel deck hieght, (ass. motor and take messurement of deck height and send back to get milled for a zero quench)you can run more com. with a good quench,it promotes better burn,but no less than .039 or pistons might smack the heads. do some research!!