magnum head help ASAP

Lets see, you'll need;

The heads of course and yes, the rockers.
Push rods - conversion units
lifters AMC lifters
head gaskets (La or Magnum will do)
Head bolts Magnum head bolts.

Figure in shipping/handling and /or tax if purchased in your state.

The Magnum heads can take *I think* I read, .510 lift. Make sure you have clearance or have different seals put in by a shop for clearance.