Originally Posted by korruptd4life
how do i find how big of an engine i can fit in my car.
First you determine what kind of car you have, and how big the engine compartment is. You determine you skills at engine swaps and whether you need a bolt in swap or if you can fabricate something, then you need to know more about engines than what video games tell you.
Any automotive based engine can be put into any car, given enough fabrication skills.
We'd need more information on your particular car and what you want out of it.