OK i know this has been discussed before but i cant search to find the info since the site was shut down. so on that note can some one please explain how you get the 1jz(4cyl) head on the 2jz(6cyl) block. and what needs to be done to get it in my 87? i just don't really understand the whole 1.5Jz and would really like to know how it works and what kinda power you get out of it.