1995 Saab 2.5 v6 engine swap how to?

Swap to... what? A turbo-4? A V-8? A Mazda Rotary engine? A jet engine out of a Saab Grippen? What is it you are trying to accomplish? If it is an engine rebuild you are talking about, start with the factory shop manual. The manual is not cheap, but neither is a rebuild... or the change to a different engine. You need to educate yourself about the integrated systems of the existing engine before you can attempt to change to a different engine. An "engine swap" is not as easy these days, with computer controlled engine management systems that also must work with the traction control, anti-lock brakes, and other computer controlled sub-systems on the vehicle.