1992 Powerquest Engine Upgrade
 

Hi I have just bought a 1992 Powerquest 230 Conquest and have gone through and replaced and upgraded all the interior that was damaged and build a full stereo upgrade. I have also custom wrapped the entire boat with vinyl. I am now after replacing the 454 for something with a lot more power. I am looking to find out what I can swap in directly or what I can fit with modifications. I was told I can't go any bigger then a 502 or 508 is this true? Also what kind of power can this hull and transom support?
Thanks for any help you can offer.