I am running a 100mm stem on my 61 c-t-t frame with 586mm virtual top tube and think for a tall guy with long legs running a bit bigger frame with a nominal stem size like you are targeting is a good ticket especially if doing some touring.
Good Luck...may be moving my campy brifters up a tad on my Deda bars per your tip the other day. Does anybody know how to remove the rubber hood covers on a Campy brifter (Veloce)? They may just peel off. Need to get at the bar tape which runs under each hood cover. There is a little button on the inboard wall of each brifter hood cover and not sure if this is a pin to hold the rubber hood cover in place or not.
Thanks,
George