Gotta do something, got a big motor hole in the firewall now. And for the original heater core tube holes a small fabricated plate with fabbed foam or rubber seal, painted to match and secured with SS screws will fix that.
You did see the picture I posted for the heater motor plate? I used butyl tape to seal it to the firewall.
Condensate drain was run below the heater box out one of the body plugs so I didnt have to drill a hole. I went to lowes and bought some clear tubing and some plastic 90° fittings to make the transition smooth. Extended the drain down past the frame rail so it didnt drip on top of the frame.
