Backspacing on front wheels

[johns2000]

What kind of back spacing are you guy's getting away with on the front wheels? Do the 1 1/2" drop spindles make any difference? I put a 15" wheel with 4 1/2" B/S on my original drum setup just to see how the wheel would fit and the inside lip of the wheel was hitting the upper balljoint, that's without a tire mounted on it. I ordered the disc brake conversion from Drop/Stop with the 1 1/2" dropped spindle and would like to know ahead of time what will work clearance wise?

Thanks

I figured it out, it's about 3 and 7/8 for anyone else who needs to know!!