Is your 79-95 Mustang Overheating? Have you changed your Thermostat lately? It could be stuck causing your Coolant not to circulate properly. LRS carries OEM Style Replacement Thermostats in both 160° and 180º versions.
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.