I've been rebuilding/replacing those MC/SC's for over 30 years. I've done a fair number.
My experience has been it's hit or miss and I've not seen any indicators at the time whether a particular rebuild will be successful or not. I usually base the choice on how much time I expect to have in the coming weeks to do it over again (and how much I got a new unit for). For customers I nearly always installed new, unless they chose to try a rebuild.
I've always done both, plus the flex line, at the same time, unless my customer refused.
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic