Starter, coil, ignition module, all electrical parts should still work with the 304. You are going to need a larger radiator and a larger overflow tank once it's up and
running. My 258 to 304 swap went smooth except for the overheating aspect. What tranny do you have? Some (like the T-5) aren't strong enough and were
never meant to run with a V-8. I'm still using a rebuilt T-5, but it'll probably go any time now... :-(

Keep on Jeepin'
Scott