To me, none of them make a difference in value because the original is gone….period.
If you to have to have something that looks the part, I’d go with a service replacement.
Me personally, I’d leave the transmission in there unless you feel that you have to change it, or if you found the original owner to that trans.
Kurt
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1969 SS396 Post Sedan Delivered to Van-T Topeka KS
MCACN Day2 Concourse Gold Award
1965 VW El Lobo Dune Buggy built in the mid 70’s for the Iowa Shriners
1968 Schwinn Orange Krate
1969 Schwinn Pea Picker
1968 Schwinn 5-Speed
1970 Schwinn 3-Speed Deluxe
1972 Schwinn 10-Speed Continental
1973 Schwinn 5-Speed Suburban
All Original Paint Bikes