I don't think mileage matters on a vehicle that has undergone a complete restoration - I see those advertised as "5K miles since complete restoration" ... depends on what complete means to you.
If you're buying an "original", untouched TA, I guess mileage matters against price.
If you're buying a rarer vehicle, say an SE, how many are really left? Mileage or not, I say buy relative to the costs to fix/make it what you want it to be.
Keep 'em alive.