I would be careful on the Centurion Pro Tour. Some of the early versions had clearance issues. My 81 Pro Tour had 27 x 1 1/4 tires & fitting fenders was very difficult. The cantilever brake posts would not adapt to 700c without moving them lower but if they would have, 700 x 28 would probably be the limit. My 84 Specialized Expedition Touring takes 700 x 32s with room to spare & could easily go larger.

Other suggestions in order of availability would be:

Trek 520 Touring, Raleigh Super Course (early version made for 27 x 1 1/4 will convert to 700 with huge clearance), Motobecane Grand Touring, also mid 70s Motobecane Grand Jubile has good clearance with 700 x 28 & might be able to go larger. Miyata 1000 Touring Early 60s Zeus has great clearance but good luck finding one.