Thrill, what kind of info are you looking for? There are alot of good books on the subject out there, but the best thing to do is hookup with someone who has experience building them.
Marine engines are a bit different than car engines, I have alot of experience with both aspects. Im hoping to get back in the business soon myself. Id be happy to offer any help i can.
A few books i can rcommend to you are by HP Books
Big block Chevy Marine Performance
Smll Blk Chevy Marine performance
Performance engine Blueprinting
These are just basic info manuals , but they do offer some good help.
But as i said the best thing is to work with someone with experience.