I'm hoping Don will take the reigns on this question..but I'd appreciate any info from all you guys. I have a Merc 454 in my boat now (26' Chris-Craft limited). I just purchased a 1991 502 Mag from a good friend of mine, that is in perfect shape, which I plan on doing a few horsepower upgrades to (cam, intake, carb). I could use some help with stock horespower numbers for this engine..and any other pertinent info about it (good,bad things). I know you guys are all gonna roll your eyes when I tell you this..but I'm gonna make 500 hp with it..stick it in my boat..and be the happiest guy around...lol. What do you think ?