Keep asking, and pretty soon somebody will toss out a number you want to hear. Of course, it will be a total WAG, but that doesn't matter- - - - -internet advice is worth exactly what if costs you to read it! I can "rebuild" a stovebolt engine with a cost of anywhere from a few hundred dollars to a few thousand, depending on what I want to claim is a rebuilding job. If you're a real cheapskate, I can do it for the cost of a few cans of spray paint!
Jerry