KH vs Mopar DB spindles

Can anyone get me some dimensional numbers to look at for comparison. I have '72 KH 4 pistons and want to get dropped spindles. My idead is to either machine the spindles or get bearings with corresponding i.d./o.d.. So my only hang up would be length of spindle or undersized spindle o.d.. Also would the KH caliper mount up? I don't want to start all over on my brake set up but it's looking more like I'll have to.