If they're from a RWD application, I would think they would work. Set them side by side and look for any differences. I know there are several different heads, but I think the changes came with the FWD heads. You might want to put a call in to your local junkyard tomorrow, to have them check the interchange. If that doesn't work, try a local machine shop.
Heads Thank You.........they are from a RWD setup.....I dont see why they wouldnt either but I didnt know if an even-fire or odd-fire made a difference