Barracuda Wheels

I plan on running 15" Mopar Ralleye wheels on my '65 FS. Stock 5 on 4" bolt pattern, with stock Kelsey Hayes disc brakes front, 10" drums rear. I am unsure about the offset and backspacing. Wheel Vintiques makes these 7" wide versions that I like, available from Summit. Probably will go with 225/60R15 all around. Is the 4.25" backing spacing correct for my application? Issues?

Wheel Vintiques 61-5754044 Wheel Vintiques 61 Series Chrysler Rallye Silver Wheels | Summit Racing