Stock 330's should stay stock. For any decent upgrades with a noticeable hp increase, you'd end up replacing most of whats in them. Better off to sell them and start with engines more suited to hp upgrades.

Since I have to replace at least 1 exhaust manifold, should I upgrade them now? Then do intake, cam, heads? I think it would still be cheaper than buying new engines??

Jusst depends on what you have there all ready. I have upgraded quite a few of the 330's, but you have to start with realistic expectations, because you eventually spend about 60% as much as just starting from scratch or brand new. If you are realistic when you begine than you can get some good net gains, but not as wild as you might have dreamed.

Keep in mind that even 100HP increase will feel like a night and day difference.

Like these.

Call Scott at Victory Marine and he will hook you up. Tell him I sent you and he will get you an even better price.

http://www.offshoreonly.com/classifi...o27596-en.html

You will need to change exhaust, but this is a bulletproof package and they are brand new.

i would look for a good freshwater 502 long block out of a 500hp or hp500 efi... or a shortblock 502 and start there. salt water messes stuff up! i have had a hard enough time making my 502 mag gen V what i wanted on a budget. and it was all freshwater. but trust me you get it and build it yourself there are so many good people on this website that will help you with any/all questions. without OSO i would be bald from scratching my head.