When I bought my 1970 C/10 it had a 160 degree in it. Ran like crap, sucked gas like there was no freaking tomorrow, took 30 minutes to warm up enough to drive, and the heater would not keep the cab warm. I put a 194 thermostat in, and presto-buzango! No more Problem!
Bob
ps,
I just found out yesterday that Patsy Cline is God!