1967 Cuda FB project

I have a question: Now that I have filled the fresh air intake opening, what is a good option for air intake? Or, is it alright to just use the driver side vent area for a recirculating air intake? Draw air from the pass side opening, for the heater/a-c, and take it from the driver side opening? Basically recirculating the interior air.
Or would a fresh air option be really needed? There isn't too many days here that either extreme will be used. Most days one never turns on the a-c or heater. A-C can be used on recirculate no problem, just thinking about heater/ defrost mode.
I don't see why this setup wouldn't work................:coffee2:
The only downside I can see is that the driver would be "hotter/colder" because of the intake for the heater system right in front of legs.