Looks like a nice project. We transplanted a S14D into our 1250 years ago and is quite a work horse.
Looks like your father may have had the engine replaced at one point in the past. That green is the original Wisconsin engine color. Bolens painted them white on the 1476 to match the tractors color scheme.
Bolens 1000 is a very helpful source for parts. I've bought some items from him and his pricing is fair with quick shipping.