Doesn't matter
I don't think it matters which way it goes back in. Sounds like u-joints to me. They are faiirly easy to check, just look for slop.
Rev
__________________
'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
|