I have a set of 22 inch rims i had on my cadillac the tire size is 245/30/22 my buddy is interested in them for hiz 300zx 93tt

That would be a 27.8 diameter tire compared to the stock 24.7.

It might just fit when the wheels are pointed straight.

You'll almost certainly have rubbing issues when turning or hitting any kind of bump.

This is even before you get into bolt pattern and offset issues.

I'm going to say they won't.

22's don't fit z's.. any kind of z.

ok so they might 'fit', but they won't fit.... as in, butt fuck ugly.