Now that it's running, I've found that there's an issue with the engine, must be some issue with the cylinder bore, or piston rings as it fouls plugs on 4, and 6. So, decided to go ahead and run the 347 that is sitting on the stand. Although it has been on the stand for a couple years I have turned it over every month or so, and run the oil pump while I was doing so.
I've got a new clutch from Promotion to put in at the same time as the Zoom clutch in it now just doesn't work well with a rev happy engine with a light flywheel, and the 86MM TB doesn't help much either.