Not running a thermostat will have factory efi motors running in the FAT part of the cold enrichment fuel map, good if you like buying petrol. Bad for cylinder walls and cat convertors.
They are designed to run 80-82 degrees, and if you aren't running a radically modified 4age, the crappy looking plastic tanked paint peeling from it radiator will do the job. My 4agze is happy as with the standard radiator and a tridon thermostat. Melbourne is cold and we need the heat.
You got the water pipes going the right way? I guess it makes no difference if you aren't running a thermostat tho. Or does it?
Does it make good power?