Heating up after car is shut off

George Jets said

You want to make sure you have a full 4 gallons of coolant in your small block engine plus whatever coolant your heater core takes.

It's hard to get all the air out of the small blocks upon initial fill, unless you drill a 1/8" air bleed hole in your thermostat.

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NO, it's not. (hard) Just disconnect the heater hose leading to the intake manifold, which is below the stat, and prop it into the air while filling. But I would agree that ALL stats should have a bleed hole

As long as the thing is not puking out the overflow, this is perfectly normal