If you're just selling the engine block, it may be worth $100 or so. You need to be much more explicit about what you are trying to sell, ie. pistons, crankshaft, sump, etc.

You can't just swap a crank over from one Capri engine to another without a full rebuild. You need to get it all checked out properly. Old Essex motors are a bit different to others. Certainly parts can be swapped but not without boring etc etc. Your crank for one won't just swap with no work done. They were line bored for each individual motor. As for highest number known I think it stands at CKME34053p unless some one knows one higher.