226 Flathead Overheating

Hello everyone, I am new to this forum and looking to get help resolving an issue.

I recently purchased a 226 flathead 6, the guy I had picked up from told me it was a running engine before it had been pulled out. So i slapped into my Ford 49 shoebox and As the engine was running the temp started to raise and eventually over heat. I turned it off and inspected it for any type of leaks in the radiator and the engine block, nothing.... It has a new 4 row aluminum radiator, new hose, also tried it with the thermostat on and off,and the water pump spins freely by hand. So I am at a loss. This week I am going to be trying a couple of tests like the cylinder leak test and a pressure test on the radiator just to be sure. One other thing, when it is smoking it seems to be coming from the radiator area and it's a white smoke. Please let me know if you have any suggestions to help me solve this problem. Thanks!
 
Just to clarify, thermostat in and out, does that mean installed and removed?
And the white smoke, is that steam from overheating? Could be coming from the overflow?
You need to make sure your ignition timing is correct.
 
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