I'm not an expert at all, but I was looking for an answer to a similar question (want to replace my seized '84 V6 with a newer, more reliable engine) and found a page on this very site about engine swaps that says they all have the same bolt patten.
"Transmission compatibility is a consideration in this swap. Several transmissions were offered in the Ranger over the years. The one common factor is the engine to bellhousing bolt pattern which is identical for all years. The early model manual transmissions have a shorter input shaft with the pilot bearing in the flywheel, while the later years are longer with the bearing in the crankshaft. Of equal concern is the light duty design of the early model, which makes it more vulnerable to breakage. Newer model transmissions use a slave cylinder inside the bellhousing, so you'll need those components and the interconnecting tubing if you elect to swap one in."
http://www.therangerstation.com/tech_library/4L_Conversion.html