Ok, its been a while and alot of fun things happened to the truck.
The overheating, well, we tried taking the thermo off, and it does run good, except when its on idle, not going anywhere, the temp rises, i bought a brand new shroud, because the fan is about 8" away from the radiator, so theres barely any air going through the radiator, except of course when its moving.
When the truck is moving the temp is around the 160s, not bad

, had the rad tested and everything is it checks out better than new, i dont know how it happened, but that was what the rad shop told me, the average for my 4 core was i think somewhere around 45 gallons per minute and it gave him almost 50.
Alright just an update and someone might benefit from the tips and my mistakes.
__________________
K10 1967, SM420 & Rockwell T221

C1500 1991, 305 CID, Ext Cab, Full Size bed, everything original except air cleaner.