Putting in a new heater core

[lukecp]

After two years of lukewarm heat, and a slow fan, i finally broke down and bought a new heater blower motor and heater core for my non A/C '72. I put the new blower motor in the other day, and it blows twice as fast, but the heat isn't that warm. So i plan to put the new heater core in this weekend. So, how should i go about replacing the heater core? First i drain most of the cooling system, disconnect the hoses from the heater, remove the heater box and then put in a new core, right? I remember someone saying several years ago that he had to remove the cowl panel to replace his core. If so, i just unbolt the cowl by the hood hinges, remove the antenna, windshield wipers, and the screws in the middle of the cowl, or is there anything else?
Thank your for any help.