in too deep: trying to go BBP on a 68 barracuda and its going.. poorly.
I wouldn't re drill a damn thing. I used the Moser axles with the offset for the f/m body rear drum plates. I robbed a full set of plates and hardware off a Diplomat sitting down the street and it was a pleasant afternoon that made life kinda cool. Pull the old axles, pull the e brake cables and brake lines, toss the A body drum setup with their hard to find drums in the trash (err, classifieds) and stab in the new **** and hook it all back up. By the time you sell the A body drums, this option got a lot less expensive and when all the rear brakes come from one car, getting parts just got a whole lot easier. I actually stamped what they were off of into the backing plates.
No custom parts, no machine work, no drilling anything, no hard to find drums, no headache, no messing anything up, and no one-off wear parts. Didn't even spill any oil in the driveway or wear any safety glasses.
And fu*k 'green' bearings, if we haven't got to that point in the arguments yet. Tapered Timken or go roll a Ford.