Lookin good man. Our 65 has been my daily as of late. Been fun driving it on the regular. Been trying to solve the whine in the new altenator by tuff stuff. Swapped it for another of same model and same thing. They are never done.
Have you ensured the pulley alignment is straight? Even the smallest offset can cause that. Since you’ve replaced the alternator - that could be it. Does the belt show any differing wear side to side. Things like that ? If your way ahead of me ... ignore me. Lol.