Got a coolant leak coming from your thermostat area. 99% of the time its the Thermostat gasket. The can get damaged when replacing the thermostat or just wear out over time. Either way LRS has you covered with Replacement Gaskets.
I have been ordering items from Latemodel Restoration for many years. I've found them to be exceptionally professional, timely with order processing and shipping correct items ordered. I've never received an incorrect item on an order.