How do I Replace the Heater Core in a 1980 Dodge Aspen?

How do I replace the heater core in a 1980 Dodge Aspen? Its leaking and I guess that's what caused the blower motor to rust out. Anyone know how to get to the Heater core? How do I remove the dash?

It has a slant 6 with factory Air, but I have removed the A/C
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