das280zx

I would try and find a n/a 81-83 L28 (2.8 liter motor). I'm pretty sure you can mount some 240z carbs up to it no problem. They will have to be re-tuned for the bigger displacement. You should be able to get at least as much hp out of it as the 240 originally had. 240's had 150 hp gross, which is probably like 130 net or something. A fuel injected L28 had 145 hp max net. In a car as light as a 240, it should feel pretty peppy. There are tons of stuff you can do to the L28 with parts swapping and stuff. One important thing to note is that the later L28's cannot be equiped with a mechanical fuel pump, but this is not problem as an electrical one can be hooked up easily. If you switch to fuel injection, there are a host of things that will have to be addressed. It is not that hard to do, but you should do some research on zcar.com. It is a great site, lots of history and a good search engine.