So I removed the thermostat and unhooked the lower radiator hose. I turned the garden hose on and shoved it in the thermostat housing. The water ran right through the block without backing up at all so the block is fine. I just put the thermostat housing back on without the thermostat and I will run it tomorrow since it's too late to bother the neighbors tonight.
1970 Barracuda B5 6.1 Hemi/6 speed 1969 Charger survivor in R6 383/727-wrecked 12/24/18 1968 Charger in original burgundy paint "Ribeye" 1968 Charger w/ 6.1L, TR-6060, 9" 1968 Roadrunner w/ 6.1L/6 speed 2011 Dodge Ram w/ 6.7L
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