i have a 91 geo prizm with the 1.6 16v dohcs. what engines can i put in that will bolt up the same or with little changes?

 

Pls help – Engine Swap 4AFE to 4AGE 20V on Corolla Sedan AE101 1994 - Toyota Nation Forum : Toyota Car and Truck Forums
There's a thread that'll help you out. Your car has a 4A-FE. Your easy options are 4A-GE and 4A-GZE. I imagine these wouldn't be super difficult, in my five minutes of searching and reading I've gathered enough to assume that they're the same blocks, with the same mounts, that will fit in the same cars. Silver top 4A-GE makes about 155 hp. 4A-GZE makes a hundred sixty or so with a supercharger.