Thanks Rich A. I am currently using a Pertronix unit in my Mallory YL. What a great upgrade! However, I am thinking of trying a vacuum dist to keep the heat down at idle and adjust the spark advance more appropriately depending on how hard I want to accelerate.
I can get a Mallory with vacuum, but:
1/ I have to re-pin the gear to handle the HV
oil pump
2/ Even then, I have doubts as the gear is an easy slip fit on the dist shaft (should be a light press-fit) and the split pins may eventually fatigue and break
3/ I have a squeal (maybe a high pitched whistle)from my engine when run for over an hour.....I think it's the top dist bushing, but can't seem to pinpoint it. For now, I blame the dist.
Everything else I see, appears to be too big to install. I like the Accel unit because the vacuum advance can is adjustable, but it seems to big too. Pertronix obviously works well, as I am using ignitor unit with great success. MSD?....Summit "no-name"?? I'll keep investigating.
Kind of a pain being in Canada, ordering from the US, and then wanting to return it if it doesn't fit (plus most parts suppliers don't want to take electrical items back).