'69 Barracuda T56 swap, floor, cross member

I think taking the HVAC box out is probably a good idea. I agree with @goldduster318 too, I'd much rather modify the lower ducts than anything else.
Was planning on a kit from Original Air with Sanden compressor and modern condenser all new under hood and recondition original hvac box with DMT kit. My heater portion of the box I know that is not broken and through the life of the car I been only one that did heater core replacements etc. So I don't think anything is broken under there and all the vacuum still works etc.

I still have all the original under hood AC components box tagged in dry storage in excellent shape. They were pulled in 1981 and car had 72k miles on it so they are nice parts. I just don't want the bulky heavy original compressor back on there. But not selling parts cause its a factory 340 car etc etc etc.

For now I think pull hvac box and put the unit on a shelf and get back to the 6 spd conversion. Then after 6 spd swap done come back to hvac system. That way I can stay focused on the task at hand.