Well Alec, good thinking and a great answer, but you have glanced off the target a few times and swerved around a podium place!
If you changed one word you would be almost there...
Max advance quoted is 20 degrees at 1200 rpm, this is at distributor speed, so you will have to adjust for your trigger being at crankshaft speed.
Max engine revs are 2400
Doesn't sound like a split rim to me either, if you don't exactly know what your doing, it would probably be best to take them to a tyre fitter, extreme danger lurks within those things...:nono:
Not so much in the taking off as in the pumping up!
It's rumoured that Mack had a huge amount of money spent on the restoration and paint, so not sure why the engine used to sound like a box of Chinese fire crackers..hopefully fixed by now.