Wheel Size cragar SS

I know this has been brought up many times. But I am trying to nail down exactly which ones to order. I am not looking for wheels that stick out past the side of the van. Just a great looking size and fit that fills the arch nicely without interfering with stearing in the front. I believe 15's are what I am looking for but if there is some benefit to 14's other than visual preference I would love to hear about it. I have gleaned the site and have come up with the following as my best guess for cragar SS wheels:

Front Wheels: 15x6, backspace???, part number???
Front Tires: 215/165 or 170R15 tires

Rear Wheels: 15x8, 4.25" backspace, part number 61815
Rear Tires: 275/160R15 tires

Both in 5 x 4.5 lug

First: Can someone provide me the correct backspace for the front wheels? Part number would be great.

Second: Is this setup going to work with a slight drop of say 1 to 1 1/2"?

Am I going to modify the wheel well to accommodate this?

If I have anything wrong please let me know.

Thanks for the help everyone.