ok,got ya,i feel stupid even asking now....lol,im around 400-425 at the moment,75hp seemed close...ill stick with the s/c plan...
I personally don't see 500hp in a streetable EFI package with only 331ci and 185 heads being possible. There are members on here with built 331's put together by some of the best in the business and they aren't making anywhere close to that number. Heck....I'm sure I'm a good 125-150hp away from it myself.