Here's how to remove the heater box from your '64.5. Look up under dash just in front of the air vent...see screw? Okay now wait! Disconnect cable from defroster just above transmission tunnel at top edge of carpet (if you don't and the duct is cardboard, the cable clip will tear loose from the cardboard). Plan to replace the cardboard with the aftermarket plastic duct anyway! Lift the hood and look at the heater fan motor. There are four Tinnerman nuts on four posts around the fan motor. Remove them. Now remove the screw thats up under the dash above the right air vent door. When you do, the heater will come loose and want to fall. Pull it towards you and let it drop a bit. Note that the heater hoses will hold the end of the heater but if you thread them back a small amount you should be able to turn the heater away from the kickpanel without having to remove the hoses. You can disconnect the other two control cables if you wish (I normally do since it makes the job easier).
If you wish to remove the hoses for reasons of necessity or convenience, remove the engine ends first, drain any fluids from the heater core and then remove the heater and hoses (I usually just cut the hoses at a convenient point and plan to replace them). Remove the heater box to your workbench.
Do what you have to do for the door plates.
Consider rebuilding the heater box while its out. The heater repair kit is about $20 and the heater/defroster works much better when the gaskets have been recently replaced. When replacing heater, attach hoses first, then thread through firewall and get heater almost into position. Attach control cables, push up into position, insert under dash screw and tighten it mostly to hold the heater box in position. If you can't do this for some reason (working by yourself, etc) then put the heater box in position, prop up with flashlight or similar sized object, replace Tinnerman nuts sufficiently to hold heater box in position then insert under dash screw and tighten.
Good luck!
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