I think your best bet, is to list the motor for sale and see what offers you get on that, at the same time, list the rest of it as either a parts car or like the posts as a roller. My guesstimate is you should be able to pull at least 6500.00+- I agree though, why start over? Part out what you don't need and buy a roller, with what you say you have done to the motor it should be an easier swap veruses starting fresh and from a financial standpoint you'll profit more in the long run by keeping it. If you decide you wanna sell it (parts, roller, entire) let me know i'll help get the word out.