5.2 parts interchange

Okay, so I have a 66 Belvedere with a tired ol poly 318 in it. I was given a low mileage 2001 5.2 Magnum engine years ago so I figured I'd throw it in the Bel to make a decent driver. I have a few older core LA 318 engines I can use for parts like timing cover and whatever else. I have gone through the Magnumswap.com site but am unclear about what I can and can't do. Maybe I didn't read close enough?? So here is a list of some things I could use some help with:

-balancer. Can I use an LA 318 balancer or do I need to buy an aftermarket piece?
-trans flex plate. Can I use an LA style flex plate?
-are the engine mounts the same as the 5.9? Meaning 318 mounts won't work?
-engine oil pan that is needed is a car 360? Car 318 won't work?

Thanks for any info you can give.