Back in the day, even in Nebraska, 383s and 440s came with the same head castings. So all the ports were the same in any model year. There isn't any such thing as 440-sized or 383-sized ports. It's not like the chevy world.

Exception: In 1967 there was the 516 head and the 915 head, these were a little different in flow, and there were some 915s that had larger exhaust valves than other 915s.

There are probably some other examples that nit-pickers will focus on, so be it. One of the reasons that I like Mopars so much is that when you buy a 440 from a '69 New Yorker, it has the same head, crank, block and rods as the high-performance ones. You need to change camshaft, carburetor and exhaust manifolds. A double roller timing set and a heavy duty set of valve springs complete the transformation from regular performance to high performance.

R.