Steep hill, or jack the front end up, or run it up on ramps. Run with radiator cap off for 15 minutes...until air bubbles cease. Keep heater set to full hot.

If that's not good enough, drain the coolant and run radiator flush with water through the system. Remove the thermostat when doing so. When done, pull both heater hoses where they attach to the block (not the firewall, the pipes deform easily there). Flush and back flush using a tapered hose nozzle held to heater hoses. Use low pressure controlled at the spigot. Drain again and fill with distilled water. Drain again and fill with coolant. Repeat first paragraph. Note: If you mix the coolant, use only distilled water.

 

Yes, steep hill AND ramps.

Motor mounts are not bad. Getting your knuckles in there, along with a wrench, well, that's another story. Just support the motor, do one side at a time, and you'll be fine.