What kind of engine to transmission bolt pattern does a 944 1987 5 sp 2.5 have?

Actually the bolt pattern for the transaxle is not really an issue because the torque tube of the 944 is what you would bolt up to the V8 or V6 your thinking of. The transaxle is in the rear of a Porsche 944 and a long torque tube runs from the rear to the front. This torque tube has a very generic bolt pattern and it is very easy to adapt a plate to it that will mate up to most any V8 or V6 bellhousing. This makes the swap easier that you think. So the transaxle is not a big deal as it will still be bolted to the factory torque tube so this swap would require just one adapter at the very front of that tube.