I have a perfectly good set of D3ZE-AA heads that I got from my dad a few days ago (free) and was wondering what I would need for them to work and if they are worth putting on my car? These heads are 351C 4V heads right?
According to what I have they are in fact 351c heads
73-76 cc combustion chambers.... 2.19"/1.71" valves....2.50"X1.75" intake ports and 2.00"X1.74" exhaust ports.
I'll assume you mean make them work on your 302.
Right off the bat you know with the larger combustion chambers your gonna need new pistons to bring the compression up to something desirable, regardless you need new pistons due to the cleveland valve placement and an intake specific to the this swap, appears its even worse you'll be needing a custom efi intake. All of a sudden with the pistons and custom intake they aren't so cost effective anymore as opposed to a good set of new or used heads, IMO. Do a search for 302 clevor or 351clevor. Good luck
You can use this link that is floating around to compare the flow data of the 351c 4bbl heads to others.