someone help me with my slant 6 problem

Just a stupid comment on my behalf as I did not read the entire thread and maybe this was covered but if you are not spitting out fluid or turning the upper rad hose into a 'Ball Park Frank' it may be as simple as changing the temp sending unit. The little post up in the front of the motor right by the valve cover that the brown wire connects to. My Swinger was running hot at least I thought it was until I changed out the sender. Of course this was AFTER I flushed the system, tanked the radiator, changed the thermostat and hoses! At least the car runs normal temp now.
Chas.