a body rearend question

I havent seen any b-body axles those yrs that were not tapered,so more than likely yours are tapered and will not support being resplined,you could possibly find some c-body bbp axles and do that[you would want to get the brakes and backing plates as well to make it work] but in all reality you would be wiser to redrill your axles you already have and they match your housing,bearings,flange etc,and you would retain everything as it is now as in backing plates,brakes etc....last set I had done was about 85 bucs if I recall correctly, the machinists marked and redrilled different bolt pattern then welded up old bolt pattern holes,ground down welds flush and installed news studs[I went to 1/2" studs,held up great behind a 440 4spd dart,have done this multible times and seen it done multible times and never an issue and cheaper than buying new axles,I have since cut down a trk housing and narrowed and backbraced it and purchased alloy axles from Mitchells Differentials and saved 80 bucs going to him directly over moser and others being he made them for alot of different distributors,same axles diff sticker...just my experience