I won't give you a fair price but I can give you something to gauge off. A few years back I bought a 84 750 2wd, 67 FEL and 7 BH in good shape for $ 6,700.
For a fair market price go to Machinery Link and on the bottom left corner of the page click on "used tractor price guide" and walk yourself through it. The prices it gives are for tractor only, figure about $ 1,000 more with FEL.
Hope this helps.