The '83 280ZX wheels should fit fine - the 300 ZX wheels are another story. The 300 wheels have a setback like that on front wheel drive cars. You will need spacers to get them to center up corredtly on your 240. the 280ZX wheels should have very close to the same back spacing as your stock rims.
> Does anybody know if a set of '83 280 Z
> wheels will fit a '72 240 Z. Also will I
> need spacers to mount a set of 300 ZX wheels
> on a '72 240 Z.