with rebuilt, low demand parts you're not likely to get much for them since there's no gaurantee that they were rebuilt correctly. You should be able to get like $400 for both if you're lucky (not a high demand for that combo you have). Most early 80's ford cars came with the C5 and alot of other fox bodies came with the 3.8L as well, but most people with older fox cars that would need those parts are likely to be cheap with their car anyway. Good luck, hope this helps and doesn't dissapoint you too much.
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'84 Mustang 5.0 LX
My car