Not really our place to tell you what to do. But we all do have our opinions. I am far from being a true restorer, but the good frames, and everything else, is hard to find sometimes. Sportster frames are not high dollar anywhere, so you could find any later frame and put your motor in it. Or chop it up. You sure would not be the first. One problem you will encounter changing frames, is getting the title to the new frame, unless the PO has it. Plus you would not be matching numbers, which is not super bad, but for any future restorer, it would be. You own it, you make the decisions. Plus, I agree with "ironhead bobber". The more frames that get cut, the more mine are worth.