Condolences Paul, I just stepped aside from a business after 36 years last October. Bottom line - I couldn't put a price on my peace of mind, health, wife, and hardly knowing my 11 and 14 year old kids.
First off I'd say you need to find someone qualified to perform a formal business and market appraisal to give you a price guideline to negotiate from. Their line of questioning will be thought provoking if nothing else and the fee's are not horrific.
You might have a talk with Jim Goodlad at Hurst Drivelines, he sold out (Classic Chevy 5 Speed) to B&M a few years ago and is still acting as technical advisor.
Hopefully a couple of "the right players" will see the opportunity and give you some pricing leverage.
Best wishes going forward!
