For a minute I thought they could have been the wheels I sold about 8-10 years ago! Mine were American Racing Mags 4 14x8, 2 14x10s. Only reason I sold them was that even then getting tires to fit was very limited. Only larger tires (275's) I could find for the back were M/Ts. Goodyear, Firestone, etc. weren't offering them anymore. If you stick with smaller 60's (225 or 235's) you may have more choices even today, but I'd check tire availability before spending a lot of elbow grease on the slots. Will look way cool though, I know I miss mine..
Later, Jim