I know there was an outfit in Vegas looking for cores, a buddy of mine needed a rebuilt one and couldn't find one anywhere. So he sent in a number of cores, made money, and got a rebuilt core. I can get the name if you need it.
If it runs hot with a 180 Thermostat it will run hot with a 160 Thermostat. Get the radiator cleaned and block cleaned out. My Dad used to have a Six Pack 70 Charger and it always ran hot. He took it to a radiator shop and he did a high pressure flush on the block and that fixed it. You...