A V gate will not necessarily improve shifting, the 4 speed has to be REALLY up to the task FIRST. If the syncro's, forks, and side cover components are worn, it wont' shift any better/ faster/ more dependibly with a V gate
Which begs the question, IF the 4 speed and IF the "H pattern" shifter is "up to it" then why do you feel the need to "get away" from the H pattern?
In other words a LOT of racers have impressed with the lowly H pattern. Add a reverse lockout, and away you go.
V gates are a PITA in my opinion, on the street.