302 Heads on a 273

I'd use the '66-7 273 4bbl intake as my #1 choice. That way you can use your stock carb and choke without having to modify or adapt anything. 2nd choice would probably be a Holley Streetmaster or similar low profile so there is not problem with hood clearance. You probably will have to grind at least on the driver's side 302 head to get the manifold to seat against the exhaust port. do it while both head and manifold are on the bench. Grind just enough for clearance. I'd use a fairly thick gasket so I didn't have to grind too much.