Turning an A/C Swinger into a non A/C Swinger

I am curious, are you racing your car? Is that why you are wanting to save weight, by removing the A/C components?

That's the ultimate goal, yeah. But it's going to be a street machine mostly. In my little brain, a lighter car requires less power to motivate. Plus removing the A/C system means less things to go wrong, rattle leak or break and means more room in the engine bay. The A/C TXV is right in the way of the distributor on my car, drives me nuts. Difficult to get to the hold down bolt through all that crap.

Regarding the blower motor that sticks thru the firewall, is that a cover or the actual motor?

On most A body cars, ('67-up) the blower motor sticks through the firewall, unless it's a very rare heater delete car where the hole was covered up by a blank plate. I'd love one of those! Never seen one in person.

Most often there's a trim ring and gasket that retains the motor assy. to the sheet metal. Some guys just leave an empty hole when all the heater stuff comes out. I personally like a more finished, factory-style look if I can facilitate it.