Welcome aboard from Washington State!
Yep... the LS based engine are the cats ass nowadays. I have yet to swap one in one of these old rigs. But it is sooooooo tempting. One of these days.
I wish I had more info to offer, but I am still old school first gen SBC's.
This link:
http://www.67-72chevytrucks.com/vboa...play.php?f=206 will take you to a sub forum in the Engine and Drivetrain Forum that is all about the LS based engines.
Good luck and looking forward to the pics!
Gary