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If you are driving less than 12k miles per year then drive a hot rod and dont worry about fuel mileage.
There is a long thread on moparts or forabodies posted by a guy who built a 68 barracuda with a 318 he built that would get 29 mpg on the highway.
Set of TTI small block step headers ceramic coated in good slightly used shape, few scratches and one ding from prior install. Will fit B, E, F, and M body according to TTI site. Not on this site much but am well know on for a bodies and goblue9798 on ebay with 100% feedback rating.
As with all stuff from Ma Mopar, never say never.
Just my two cents but either is fine for a core to rebuild, and I would rather have the LY rods anyway.
Biggest differences that are found on motorhome 440 engines are a steel crank and six pack rods being used. Heads can also be different with more water passages. There is even a 452 head for RV's that have the small peanut type plug.
The engines built with the raised water pump are 361/413...