Need help choosing wheel size!!!

[BP68]

Hey all,

I am in the middle of a frame off build that I hope will be done by Summer next year.

The truck is a 68 Chevy short bed that will have the ECE 4/6 drop kit.
Truck is gonna be a bright med blue metallic with graphite interior. I know how I want nearly every detail of the finished truck, but I just cannot visualize the wheel size. I have looked at probably hundred of pics and just cannot decide.

Considering the wheels and tires will be one of the more expensive parts of the build, I don't want to mess up.

I know I want Foose Nitrous wheels in Chrome, 8" wide in the front, 10" in the rear. I want to keep the same circumference front to rear, rather than say 18's front and 20's rear.

Now do I go 18's or do I go 20's. Unfortunately I cannot buy both and see em on the truck.

So pls post your comments and advice on how to make that call.

Pics would be great, need wheel and tire size suggestions, and also backspacing recommendations.

I am hearing 4-4.5 bksp for the front and 5-5.75 on the rears.
How would the look differ between a 4" backspace and a 4.5"?

Thanks for the help!