Will These Wheels Fit

Will The Wheels Off Of A Pontiac Trans Am Or Firebird Fit Also What If Any Other Gm Wheels Will Fit 245-50-16 Will These Fit

I doubt it. 245-50-16 doesnt give you proper tire diameter and your tranny will be stressed, your speedo wil be wrong.

Find a tire that has an overall diameter of 27"

See how much your will actually be off...wheel size doesn't make a huge difference in the speedo...usually only 1 or 2 mph difference
http://www.paspeedo.com/calculator.htm

find out what the specs are for the bolt pattern, how far the bolts are spaced from each other.