There are 2 types of oil pumps. One for the 70 and older engines with a flat cam, and the other for 71 and later dished cams. If your rebuilt engine has a stock cam, it should have a dished stock cam, although it could have a flat cam. If your engine has a non-stock cam, it is flat since there are no dished aftermarket cams in existance.
You may have to pull your pump to find out.