Originally Posted by Rimrock F1
I would assume it would fit a F3 as well. I think it uses the same master cylinder. As for vacuum I have several vacuum ports behind my carb on my 52 F1. If you don't there are many places that sell a spacer for the carb that is drilled for vacuum.
Some changes would likely be needed for an F-3, because the crossmember is further back than on an F-1. The pushrod would have to be lengthened for sure.