I was planning to stick to race gas to keep it simple for carb set up, with a 357, but do have both a 356 on the shelf which was what was in the early road rockets and came out of this one.
Was hoping to run 9:1, but realistically the well used pair of BSA stamped 8.5:1 which came out of this motor may well get reused as they have some life left in. Seems easier to find 10.5:1 in hepolites but not too keen to overload the crank.
I've got an 1 3/8" (30mm) 10TT9 with two float chambers (was planning to run a swill pot to offset any fuel bias on corners), its slightly bigger than I wanted, but should do the job and a nice bit of bling for the bike.
The solid plain bush sounds like the business, I'll get one through Mike who is mentioned in one of the threads as soon as I've checked the state of the crank which was still standard but well used when stripped down.
I have an article (avail in pdf 4mb) on a NZ A10 sidecar racer which mentions briefly that the BSA technical department in 1954 (David Munro) recommended that a new location hole be drilled in the timed breather to give a 30 degree retard. I'd be interested to know if any competition A7/A10 users have modified their timed breathers...