Iron Clad is spot on, check all those heater components to get it all done at once. It will save you lots of time and hassles to check it all out. Also, get a 1960 shop manual as well as a '60-'66 factory assembly manual, those are super handy and have a lot of schematics! LMC Truck is a decent vendor, but there are several so go have a look at the links page to find lots of choices. One that I use a lot is
Classic Parts. Have fun and good luck with your heater project.
