The wife of friend who is gravely ill has asked me what the value of some of her husbands stuff is.[

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He has an engine that I believe that someone told me was an early Brison 4.2. On the rear of cylinder head is: 49 ZN4W1 MAHALE. It has a 6 bolt hub and also an adapter to convert to single bolt hub. It has a C@H green box electronic
ignition. The timing ring is white and 1.5 inched deep with a rounded edge towards the front. It also has a Walbro
carb. I have also been told it could be a Sach's,Walker or an Q&M engine.
I would appreciate any help you could give me on type and possible value of this engine.
Skylark