Dave,

Most likely, some one else will post info on the oil pump gasket. If not, get gasket material and make a gasket.

Did you engine come from a car (Powerglide transmission - that engine would have had hydraulic lifters) or did is come from a truck (Hydra-Matic transmission - that engine would have had mechanical/solid lifters)?

To confidently identify the engine (it may be a replacement engine), post the engine serial number: it is pressed into the block, just to the rear of where the distributor goes into the block.