VFT,
most of my experience has been with pickups so some of this may not apply as the larger trucks had longer hoods & fenders. 1955 2cnd series & later trucks ( & 55 cars ) had a different & longer water pump than than earlier models which used the same pump as the old 216. most of the vendors sell a shorter conversion pump for swapping the 55 & later engines into the earlier vehicles. this is to prevent from having to move the radiator forward & butchering the hood latch panel as was often done in the past. if your engine doesn't have this shorter conversion pump, the correct 17" 261 fan may interfere with your radiator. that may be why the flex fan was used. with all this info. in mind call jim carters & tell him what you have & what you need & he should be able to help you out as he's got a salvage yard & will most likely have the right fan & the shorter conversion water pump if that's what you need.
robert
