First of all nice build. I love the 2JZ in my MKIII. My slant on putting a untested used engine in a car, has never been a worthy endeavor. To any one reading this thread, don't do it. Always have the engine gone through by a reliable machine shop first. Steveyblack would have saved considerable money and a lot of time invested had he gone down this road. It's understandable wanting to save money but it as this is the single most important part of your car, you can't skimp here. My nephew funky_monkey58 bought a "rebuilt" 7MGTE from a member here. The guy rebuilt it himself, didn't do anything to the main bearings and a very short time later develped rod knock. Another lesson learned.
Good luck on your build.