for starters, you will need the oil pan (pick-up and dipstick), headers, intake, distributor, and the PS/AC bracket if you are going to still use them.
Then you will probably need a hood for clearance, you may need to modify your fuel rails or get new ones, and a 28oz flywheel and balancer if you go that way. I had my motor balanced for the 50oz stuff. There are a few other little things also.