sweeeeet, a mate of mine has an old school klein, pace forks, king hubs, xtr v brakes, sram x0 gripshift
old school is cool!
wev had plenty of old mount visions in for repair (im a mechanic at a bike shop)
youll be happy to know that they last forever, id probably keep the frame if i were you, they are so fun to ride.
and on the offchance you do manage to crack it, marin warranty is second to none
if you still have the original reciept they just replace it for you.
the nearest modern replacement is the new mount vision with a fox rp2 shock, had a few very happy customers when this has been the case.