I'm mostly done on my 2jz regal. If I had it to do over again I would do a 4.2 from a trailblazer with a big turbo. It's bigger than the 2jz, it bolts directly to a 4l60, it's about as long as a LS, the later versions made close to 300hp without a turbo, you can buy a used trailblazer for about as much as you would spend just on a 2jz. Aaaannnd.... no one has done it.