My 11.1 comp. 364 makes about that (500 hp) its a 347 with a 4.125 bore. (364) I have a set of afr 205 and spin it to 7,600+. If you want N/A 500 rwhp go with a 351 based motor a nice 408 could pump out that power. RNH PER. did one he// of a nice motor for me have about 75 n/a pass on it this...