Cooling System Redux - Blower Motor

On the advice of some very seasoned folks at http://www.jeepsunlimited.com forums, I'm going to go ahead and upgrade the very "reserved" jeep heater blower motor. Some might call it....sucky.

Here is the diagram I will be using to perform the surgery on the existing blower motor firewall cutout. The cutout will need to be enlarged to accomodate the 1973 Blazer 350ci w/air Siemens #102E blower motor which requires a 3 1/4" cutout.