To Stat or NOT to Stat...That is the Question?

Need input from you guys on whether to keep my thermostat or remove it. Some have told me to keep and others told me to remove it. I've flushed the radiator & put 50/50 Antifreeze in her, new thermostat & new gasket...but she's running hot! What to do?

1962 Dodge Lancer GT: she has a working heater, but no A/C (yet).

A thermostat does not control how hot the engine is going to get. It only controls how cool it will run.
So, put the thermostat in it and look for the real cause of the overheating.
1) How hot is it getting?
2) Do you have a mechanical or electrical temperature gauge?
3) Are you using a clutch fan?
4) How far is the fan from the radiator?
5) Do you have a fan shroud?
6) When is it getting hot, in slow traffic or at highway speeds?