After installing Shellie's gaskets last night, I retweaked all bolts today then mounted the Testors McCoy .35 Red Head with APC 9x6 prop in my engine test stand. After the first run, I loosened the leaking glow plug and re-centred the copper glow plug gasket and re-tightened. That fixed the leak. After a total of 8 runs on a 1-oz tank, Shellie's gaskets held.
The engine is most happy at 4 cycle barely breaking into 2 at 1-1/2 needle turns of the Evo .46 remote needle open.
She ran with the reasonably "new" (actually NOS) Swanson Associates Fireball Hot Plug. It worked, but then decided to try another for the last couple runs, and I was glad I did. I purchased from E-Bay a card of 10 HSP Taiwan N3 Hot Glow Plugs. These were recommended for 4-cycle engines. I tried one in the McCoy and she is really happy with it, fired right up, easy starting, engine really sang with it. I bought these for $28 shipping included. Talk about quality, the copper gasket is cut with a more precise hole in the middle wihout much slop, doesn't require centering as it is already reasonably centered when install.
These N3 plugs should do me a lot of good in my legacy OS Max, McCoy, Fox, and Enya cross scavenged engines.

(Note, photo has my Fireball Hot glow plug temporarily placed in the lower left bubble.)
This 2nd McCoy engine for now is a good backup for the first.