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.
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.