Re: Wheel backspace?
On the front the critical backspace is the sidewall clearance to the upper ball joint. My bird (same A arms) a 3.5” backspace with 225/60 15” just clears the ball joint. They’re 7” rims, and just clear the fender. So tires have an effect too.
On the birds, the critical dimension is clearing the rear part of the leaf spring. But I don’t think the car and bird are the same there. Pretty sure the fender clearance is different too.
You might see what you can find on the 52-59 ford group on the off topic section of the HAMB. Pretty sure it’s addressed there.
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