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What do I need to do first before replacing heater hoses for my '71 Mach 1? Do I need to drain some from the radiator? If so, how much?

Also, what size of heater hose band/tower clamps? Is it 1 1/16" correct? Thanks.
 

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Drain the entire coolant system, at least as much as you can. When done, disconnect the lines from the engine, and point them down, so you can drain anything in the heater core. The heater lines are usually connected to the heater core inside the car. Be prepared for contortions.

As for the size of the hose clamps, measure the outside diameter of the existing lines to get the size.
 
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