There's a whole DET engine+trans from a 240SX for sale near me for $500, it has low compression on a cylinder and will probably be rebuilt anyways, but comes with a bunch of upgraded stuff like bigger injectors and a Nistune ECU. It's the only one for sale near me unfortunately, otherwise I pull a 12 valve KA24E out of a 93 hardbody at the local scrapyard and build that into a turbo engine