I'm in the middle of a very basic bhg repair and I'm about 1500 or so into it. That's not doing a bottom end rebuild or mhg. You could do it much cheaper but I'm upgrading weak points, replacing all the hoses with silicone and using OEM gaskets where aftermarket bits won't cut it. I should still be able to reliably make 350hp when done. If you're after more than that than add another couple grand on at least to build the bottom end. Keep in mind that's just engine, not any necessary bolt ons, ems, etc. 2J you can take that and add the price of the motor and necessary hardware to make it work. 1J isn't really a viable option imo because of the lack of parts availability.