Re: 5 Lug Rearend Swap
You have a few options. If you want to swap the whole rear end, look for a '71-'72 rear end from a trailing arm setup. Those are 5 lug axles and the whole axle will bolt in but I do think they are 1.5" wider then '70 and earlier but that's not usually a problem.
Second would be to buy conversion axle shafts that fit your stock 6 lug housing but have 5 lug pattern. You can then use '71-'72 drums on your stock brake. You can buy these from Early Classic Enterprise or most axle manufactures (make sure they are USA made).
Third option is to by any later model axle, buy a set of weld on axle mounts (they are specific to the trailing arm setups), cut all the old brackets off the axle and then setup and weld the new mounts onto the new axle. It does require you to setup the pinion angle correctly and center side to side... oh and have a good welder. Not hard to do but does take more time. I did this for my '68.
Hope that helps ya out.
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