Uberoo

So im getting prety close to getting a title for the mazda and selling it and one idea came into my head on what i could spend it on.... an ej22. You think it would be a worth while investment to get on of those to drop into the buggy? One thing i need to figure out is if it would need the frame modified to fit in there because by the looks of it that ea81 motor is already fairly tight in there. Im not really 100% sure if im going to go this route or not but i figure the buggy would be nice with a little more power. Do you think this could be done withing a budget of around $600?