[willowbilly3]

There is a little more interchangeability on the 302. Specifically on heads and intakes. On an efi 460, a carb intake doesn't bolt up. They make spacers and even an adapter to bolt a carb right to the efi intake but there will still be no carb heat, if that's an issue. Neither efi block will have a place for a mechanical fuel pump. A points distributor can be used on the 5.0 but be aware of getting a distributor gear that is compatible with the cam or you could eat the gear off the cam.
I've been trying to figure out the best heads to swap onto my 429 because it has over 10 to one compression. It is a dizzying swirl of information on heads out there for the 385 series. I still don't know what would be best for me. Probably the D3VE if I could find them but getting all the right valve train components that play well together is another issue