Hi RR, I have just bought a 1956 RR/GF with most bits missing, from your comment it seems you have stopped racing, Shame !! ( I used to race classic with CRMC, Forgotten Era, Derby Pheonix in the mid 80's)
The motor bits that came in the boxes were mostly junk, and for the plunger, whereas mine is the s/a. I will need a bottom end and head, preferably RR as the online DVLA bike details on the V5C do not say what model it is, just a BSA .
Do you have any stuff that might help. I am waiting for the V5c as the bike has been stored since the 70's and a new V5c issued in 1984 so it is on the register. I am hoping it will come with the original registration. NRP 171.
I have a machine shop at home so sorry to say I will modify an existing engine stand
Best of luck with your sale, Barry ( Ex-Long Eaton).