Not sure you would want to go any longer than 80mm if you are running Canti's on a period correct frame? Chances are its either only mildly suspension corrected or not corrected at all. What's the frame and its year?
Ahh something that late you probably have a much wider range of choices - although you should check to see if there is a catalogue in the archive that may tell you what range will work. 100mm Z1 bombers are well regarded. No personal experience I can recommend though.