[Ggmac]

As stated above . But only a 20 degree drop tells me rad is not doing its job , but then you wernot moving . Stick a 110 house fan infront of it and retest . The fan should show a larger drop in temp , rad should be doing its job .
Unless you owned this car since new , i doubt you could depend on all the stuff being untouched . Ten thousand miles was a lot back then to expect a water pump to last when using well, pond water . Oil wasnt refined as today , rings were usually going south at 40-50 thousand miles . Maintence was key to getting even these numbers but with the depression , war and roads available , cars were neglected.