Will 15" rims with 3.5 backspacing fit my 69 Baracuda?

Thanks for the suggestions. These are not wheels I own but have the ability to buy. I was going to use the feedback here over a few days to help me make up my mind if I should go for it or not since I cannot take any measurements.

Anyone with other comments or the ability to measure on their project cars would also be welcomed.

Thanks