V8 is cheap and fun, diffrent sound, There is alot you can do to the 2.8liter turbo motor in a 280zx, and they are bullet proof also. The crank and stock pistons can handle some boost. The ignition and fuel however cannot.
A good freind and neighbor of mine races a 240z and a gen 1 rx-7 in SCCA E-production class.
He has MUCHO spare parts for 240's-280's. Including short blocks.
E-mail me if you are looking for something specific. Even some interior parts.
[email protected]