Sure, Rich pointed out that due to the order of the valves, some of these choices would require a custom cam. According to Rich, Pontiac and Lincoln would not. Oldsmobile and Pontiac have aftermarket aluminum heads available.
These are only classic engines, I didn't look into modern engines. The info is harder to come by on the web it seems. I wasn't thinking about the fact that there is .150 of bore offset allowed, so many modern SOHC or DOHC heads would work.
For some reason I thought that DOHC were not allowed but now I cannot find any reference to that in the rules.
Also if you cut a SOHC or DOHC head to fit over the bores, then the cam (or cams) need to be modified also.
Rich isn''t really interested in another OHV heads for the Dodge but who knows?
Enough rambling, here is the list.
These are engines that have the same bore spacing as the 1 & 2/ 3 & 4 clyinders on the dodge, followed by displacements that have 4" bore
Ford FE, 332, 352 (4"), 359-391 (4.050")
Lincoln Y block, 341(3.937"), 368 ( 4")
Olds Rocket, 371 ( 4")
Olds, 350 (4.057"), 400 (4" )
Pontiac 301 (4")
Happy Holidays everyone!!!