As far as fan belt I have a 5/8 on my truck. It was on 1950 216 and now on a 1957 235. I used my 216 water pump/pulley , generator, and harmonic balancer . Here is a picture and specs for the belt. Are all of your pulley sizes the same? Water pump, generator or alternator, and balancer? That is a Napa belt fyi How loose or tight is the belt?
