Changing to BBP on 83/4

I drilled my axles and drums for the BBP. I used the long screw in studs, and there is plenty of room. Also have a set of small bolt pattern axles, with long studs. I have a set of 8 x 22 x 13 SBP wheels/slicks for 1/8 mile, and 6 x 27 x15W BBP wheels/slicks, for 1/4 mile. I just swap axles and wheel/tire, same brake drum. Both sets of axles have the green bearings. About 15 min to change "ratios".
I have a drill fixture to do this.
PS: I also drilled my front drums for BBP.