You mean the canti rocker?
if so yeah remove it, or by pass it. You just need to mount the V's then use a suitable noodle (the curved metal tubes that come with V brakes) to guide the cable out from under the frame.
I'll grab a pick of my setup at some point over the weekend if you get stuck.
Oh, also Ive replied to your wanted post, Ive got 2 wheels of XT v brakes M739's earliest XT V's I believe, from 96/97 iirc.
They are advertised in my big sales thread in the sales forum (i think at £25 the lot.)