I have an NOS 3.50 FORD 8" ( C4OW part number) gear set I could sell for $200+ shipping. This gear set has been sitting on the shelf since 1974 when bought from my local Ford dealer. I am in California so shipping could be a little pricey. You may find an aftermarket gear set for less though. I have been looking for an Equa lock or traction lock ( used) so I can set it up in a third member for someone who needs it.
'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 43 years. Yes it is a real one.
'68.5 R code GT fastback
'67 Ranchero 408W -427 glass hood
'78 F350 "Oleynik" car hauler
Ford Experimental parts collector