@david-dunton I did not get to check for exhaust gas because the tester was out of stock.  I am going to check the the auto club here in Sun City West to see if they have a tester after I get the water pump back in.  I fill the system as you stated.  I have a temp gun and it showed about 200 from front to rear of the head just before it erupted.  When I started it the last time there were infrequent bubbles and I squeezed the upper hose a couple of times they quit.  Today I reset the timing  

After I get it running again I will try to set the timing to 18 degrees as Steve suggested. 

Just kind of thinking out loud but could it possibly be an air bubble, a pocket of air that didn't get coolant when you refilled?

If you are using a thermostat a 1/8" hole drilled in the outer flange will help to prevent an air pocket from forming. Also a 160 degree thermostat is best. 

@steve-d Does not have a thermostat

@tiny I thought of that and I bled it at the temp sending unit without any change

I re timed the engine, done a combustion gas test 4 times with a negative test and did a compression test with a low of 70 and high of 75.  I also flushed the radiator and it still overheats anywhere from 2 minutes to 10 minutes.  HELP please

Is it gushing out the top of the radiator? If so, how full are you filling the radiator? If you're filling it to the top, try filling until it just covers the core and see what happens. I'm not trying to be a wise guy but it's common for folks who are not used to a non pressurized system to overfill. When it gets hot, the coolant has to go somewhere so it gushes out the top. It's not over hot, it's over full. 

It is gushing out of the top.  I filled it to just above the cores and ran it about 10 minutes with no problem and I filled it to half up the top inlet pipe and then it overheated in about 2 minutes.

I just filled it to the top of the core and it took about 3 minutes to gush.  I noticed there were bubbles and just before it erupted I could hear it gurgling. 

When you rebuilt the water pump what did you do for packing? Has any work been done to the radiator? With the bottom hose disconnected does water flow freely through the rad when you pour it in? 

Dave

I replaced the packing's.  No work has been done to the radiator.  I have not tried to flush since it started overheating.  I will try that tomorrow 

Is your engine running when you add coolant? If not, try that. I'm not an expert but I've been told that can help displace any trapped air inside the engine. There's a nagging voice telling me this is trapped air.

Thanks to everyone for your help.  The overheating has been corrected, there was a blockage into the radiator that has been fixed now to replace water with coolant and get it to DMV for inspection.

I'm happy you found it.