[Ed Pitts]

Just picked up a block yesterday. This came out of a 1939 1 ton truck. The center holes (top triangular and the bottom two round) would indicate a 45-48 block but it is a 221 engine which would indicate a 1939 era block. It has 59 on the top of the bell housing. The exhaust manifolds also look like the later engines. Were the truck engines different in 1939?
No cracks in the usual place and it has standard pistons so hope this one will build.
The second set of pics are the heads that came on it. One head has an A in the casting and the second has a T. Did the large trucks have different heads?
Thanks guys. Ed