Just bought a 2" budget lift just the spacers for front and rear and bought a set of 15x8 black cragar d window wheels can I run 31x10.50 tires on it? I don't want scrubbing real bad

A 2" spacer lift will allow a 30" tire to be used. You might rub with 31s.

So If I exchanged for it for 3" with new shocks I could do 31s?

Yes, you should be able to.