Hello David, Welcome. Hopefully you will have success in your research of Conyers. I have seen several products with their name from the 60s>.
Your engine is a Briggs and Stratton, possibly 3hp , or even 4hp. You can obtain all the parts lists and opersting manuals based on the Model, Spec and Serial numbers stamped into the engine cowling right next to the Governor adjusting screw/Rod behind the Air Filter in your posted image.
I refurbished a '72' Genset some years back with the same engine and it's progress was logged in this section of the forum. If it is of any help, here is a link- 72 Genset
If you need any help with the engine, just post it here. Afraid I can't help with the generating part, as I'm not familiar with it.
Regards.