How much is a Mark VII rear end worth? Possibly trade?

I have an 89 Lincoln Mark VII rear end (8.8, dis, 5-lug) unde rmy '65 mustang and i love it. Works great, parts and gears are dime a dozen. I have a similar complete rear-end from a 90 Mark VII, that is in my way.
How much is this worth, and where could I unload it? I would trade it for a 75-80 granada/monarch conversion...

If anyone was interested I also have a complete 3.25 9" rear from a '67 mustang.
 
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