Just my opinion, but when I see boats advertised with failed main power, my mind categorizes them as "owner couldn't be bothered to fix," followed immediately by "potential project boat." The implication is it's a dead end and just want it gone. Bottom feeders are drawn to such ads. Me, I'd be wondering what else is wrong beyond just a power head failure. Transom rot?
When I see a hull on trailer, motor/s removed with clean transom, that paints a different picture. The rig has been cleaned up for sale, owner appears to care about the boat. More value assigned to such hulls in my mind.
Just my opinion of course, but I'd be either putting a used Yam 250 on it to avoid time and expense of re-rigging, or repairing the failed existing power. Then sell it and go after that dream boat you were already pondering. A boat that is truly turn key is worth more than the sum of the hull, motors and electronics, and a good sea trial with a serious buyer will put more money in your jeans. You just can’t explain how well she rides in a quartering sea over the phone or in a FB ad. Attempting to sell as is with failed power will drain away even more value, considerably more than the loss represented by the motor breakdown.