Does anyone know what size wheels/tires on this '67 GTX?

275/60/15 you'll need to roll the lips to make these fit!

On a 66/67 it’s a good idea to check the year of the rear end under the car. Both my 66 and 67 over the decades inherited rear ends out of 68-70 cars which are slightly wider width. I don’t remember how much and it’s not much - less than an inch. But it makes a difference in getting tires off and on in the rear. With 15x7 Magnums I’ve almost had to unbolt the shackles to get 235/75s pried out from under there. I’ve gone to 215/75s on my 67 and thrown out the 7” magnums altogether on my 66 rather than deal with it.

BB BELLA said:

275/60/15 you'll need to roll the lips to make these fit!
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At factory height, or the jacked-up height in your picture?

your right, at factory height it would be scrubbing when sideloaded or going into raised lots!