Jim, nice work!
Please be aware that these manifolds also bring the carbs closer together, necessitating a shorter hexbar. Also, if you have a regular shroud, the carbs will be VERY close, especially on #1 cylinder.
Jim, I think CB sells a carb top that already comes drilled for a reversed mounting.
I was lucky, my manifolds came from 2001, and were welded up, match ported, and machined by Jake Raby.