No one can tell you what it's worth, until you go thru the steps given above. Most people in your situation sell them for $100 "as-is, where-is" with no guarantee because they don't want to go thru the trouble to figure out if they are really any good. There is no substitute for getting your hands dirty, if you want top dollar.

The values given above, based on the amount of work you do, are dead right in my experience. I recently paid $500 for a bare block that had been disassembled, vatted, scrubbed, and completely mag'd. That included delivery.