Moser Rear to Narrow or not to Narrow?

On my '70 Dart, I did the standard mini tub job that everyone does on these cars. I followed the tech pages from big block dart. I then chose my wheel and tire combo first, and mocked them up under the car so they were centered. I then measured the distance to and from the wheel mounting surface., which was 49 & 5/8".

I like the deep dish look myself, so I chose the American Racing Torq Thrust "D" series in 15x10" with 3.75" backspace. I also had a custom set of 17's made in 17x11 with 4.25" backspace. I don't like a whole lotta backspace on a wide wheel, doesn't look right.

I ordered a Complete Strange S60 with 3:73 gears, detroit locker and wilwood brakes. It was $3100 to my door.