If you can, it's a good idea to anneal the pipe afterwards. Less chance of a fracture while on the road.
I don't know if silver solder is a good idea. Ordinary solder is plenty strong enough and heat is not an issue. You lose the some of the capacity for an easy repair.
'51,'56 Squares, '48 VH, '27 Model C, R67/2, Mk IV Le Mans, '06 Super Duke and Ariel projects.