Just wanted to put in another vote for a threadless fork. I do love my vintage stuff, but on a bike of this age with those components, there's really no reason to stick with threaded. I feel threadless is one of those things that really is an improvement in newer bikes. It's lighter and made perfect headset adjustment So simple, and with no special tools needed. Are you gonna still use the stem you have with the spacer(It's 1 1/8, right?) and a stack of steer tube spacers to keep the height? I personally would look at getting a new stem with some rise to it that will fit the steer tube without spacers.