Removing AC Vents from a 68 Dart

I got it out last night. I'm just thinking about what I should do with the heater core since the duct is wide open. Also if I remove everything AC related from the engine bay, I'm going to have a bunch of holes that go straight to interior. I'm thinking about just making a block off plate for the duct and calling it a day.

I'm interested in seeing what you end up doing because I plan on doing the same thing on my 68. Not a huge fan of all the AC parts. Is the heater box different on a non-AC car??? I was thinking about just swapping to a non-AC heater box and plugging the holes in the firewall with a block-off plate or something.