the wiring isint that much different, not at all some say. Still need to do more research on that.
V.7 is newer and better, dont get no vf28 crap
V.6 came in GC8's so it might be easier, that would be the only reason why i would see myself doing a V.6 swap.
If there the same price get V.7. If Version 7 is more, still get version 7