I'm running your proposed tire on my 66 Valiant. It fits with no issues other than a tiny rub at full lock turning right. I'm 100% certain this is due to the car sitting too low (I need to adjust the t-bars) and the suspension is the original stuff from 66 so its pretty tired. I'm using a 15x6 wheel, steelies from Wheel Vintiques. I agree with duster2, a 15x7 in the front is pushing things pretty hard for an early A.
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