I have an interested buyer for my rear axle assembly complete, C4 transmission, and 289 4V engine with Holley 600 cfm carb and factory FORD aluminum high rise manifold. Everything works but the engine is tired and could use a rebuild, but does run OK. The carb needs a rebuild too. Everything worked when it was pulled from the car a few weeks ago. Any rough guesstimates on what it's worth? I have an offer for $800. I'm not looking to make a mint here, just want a fair deal. TIA for any replies.