Slant 6 Overheating

I overheated in my truck, it was a bad cap. No spring left, slightest design pressure and it puked, and started the cycle, no coolant, hotter temp, more puke etc. funny thing was my gauge never made it past 1/2! Well, turns out my sender was broken, the brass contact seperated in the body to show no/false continuity, or what we call a high resistance short in the telco biz. Now I have a new factory spec 195 stat, new cap, and a bottom feeder puke tank with a vented cap. Rad seems ok. I think I was running really lean too...Well see.