22re-turbo or 2jz-turbo??????

I have a 22ret right now, but I was offered a 2jz-gte for cheap, for my 85' yota. what should I do, put the 4 cylinder turbo or 6 cylinder turbo?? If I put the supra engine do you think i would have room for 20's in the front bodydropped??? For the 2jz I would put 18's in the front. Thanks for the opinions?????