I've tried out a set of VHII's the last couple of weeks in a 1980LP-Heritage (first production run of a '59 RI).
First, I would NOT change the neck for something else. The neck pup sounds real good, and it also works real nice for leads. The fun thing is, the VHII's seems to sound better when You crank Your amp (I use mostly SLO's and old non-master Marshalls as slave amps).
At lower volumes, the neck might seem a bit dark, but I've found that it really opens up a lot at higher volumes. It has great harmonic overtones, and sounds fat.
Compared to another LP (a '99 Historic LP with original PAF's), the VHII neck pick-up seems to have a bit more punch and edge, but I still feel it has some of the old PAF's fat tone on tap. I could live happy with either of these two. :)
So, IMO if You're going for the VHII bridge, a complete calibirated set with the VHII neck would be the way to go.
I think You willl NOT be dissapointed.
Good luck!!
T.