10 record holder slant worth?

Regardless of the costs (and you're a racer - so you know you're not doing it for return on investment) I think you would be hard pressed to get more than teens for it. A new racer, knowing it's got so many passes would probably freshen the motor anyway (and probably slow it down...lol) and finding a slant six racer is not easy. What chassis is it? Certified?
I totally get you on the mental health. I got out of cars totally for a while for the same reason...