I agree that the 235 is the original motor, however, a previous owner had swapped out the 235 before I bought the truck.
The casting number on the block is 3921968. That corresponds to a 1964-76 230 or 250. I presume that it is a 230 because of the low power and 1 barrel carb, but I could be wrong. It could be the 250. I have not checked the pistons.
Also, the bolt pattern on the bell housing matches the pattern of the 327. That would not be the case for the 235.
