LA roller vs Magnum valvetrain...

I used these as a refrence when I built my LA engine with Magnum heads.

http://www.hotrod.com/how-to/engine/hrdp-9809-magnum-and-non-magnum-parts-exchange/

http://www.hotrod.com/how-to/engine/mopp-0308-adding-magnum-to-a-360-short-block/

http://www.forbbodiesonly.com/moparforum/showthread.php?38510-My-Frankenteen-build

Lots of good info in there for you..