David, It would be easier, and we could tell you more, if you gave us the casting numbers on the blocks. They should be on the block just to the front of the distributor. 6 or 7 digits.
While you're at it, the head casting number would be usefull, as well. It is located on the driver's side, forward of the caburetor and on the flat part of the flange (where the manifolds bolt up) Sometimes they are pretty well obscured by crud.
Other things to look for that will aid our id process:
Are the valve covers held on by 4 screws at the edges, or two acorn nuts in the top center?
Has the sheet metal around the front top of the radiator been cut/mangled/hacked?
Thanks,
John
