Time and Money is your answer to all the conversions,
all of them are relatively easy, and if you search you will find mountains of information, look at the build threads
The more you ask and expect, the more you are going to annoy people
CA/SR/4G63/93, Engine mounts need to be fab
RB/1/2J/1GGTE/7MGTE any 6 pot motor, firewall mods and the 1UZFE
Any of the above engines are going to destroy things if its a slider and not setup properly
Budget for 15 - 20k for reliable package at least, or buy one already done