You don't want the early splined axles. And the chart you probably got the 62-70 reference from is a POS. they aren't the same widths for that range of years.
Ideally, find a 65-67 B body rear, it's slightly shorter than the 68-70 rear. Here's a good reference for rear end widths.
Actually the info i have is right. I plan on getting over all length and perch width before i make a buy. TI am looking for 59" or less X 43-44 perch ideally but like i said ill cut and re weld that anyway to fit my 43" perch.
Thank you for the info tho. I hope i find what you suggest. I would be very happy.