Deleting AC, heater box questions

[russgt]

I am deleting my AC off of my 76 blazer and am wonding how difficult the heater box swap is. I have a delete box located and I need a new heater core anyways, but I am not sure what else has to change? I know that the controls are different and the vents in the dash are too but I guess that at the moment I am only concerned with under the hood and making sure the floor heat and defrost work correctly.