AC delete

I want to delete my ac unit from my 1970 Skylark convertible. Besides patching the opening in my firewall, and obtaining a heater blower box for the firewall side, is it necessary to use a non ac heater core, and a heat only unit for under the dash? I already have a new ac heater core, but I know the inlet outlet tubes are slightly different. I want to use my existing under dash components if I can. Thanks
 
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