I have a couple 86-87 hj60 harnesses here if they are of any use? I know they are a bit different but most of them should be the same. I also have a CT26 from a supra I believe that might be useable for your truck?
Why would you use a mini truck/4runner body if you are going to modify it to the point of not looking anything like a mini truck or 4runner? Adding 12" to the hood and fenders to accommodate the engine will be challenging to make it look like...