I'm going down the rabbit hole on my car again. LOL! Converting to LS engine. Rewiring whole car, etc. My floor is in very good shape. Has some minor rust that needs cleaned up. Also pulled the old nasty insulation off of the inside of the firewall. Going to insulate with the stuff linked below. I used it in my K5 Blazer. Good stuff that's reasonably priced. But I got to thinking about the heater box. It has no insulation at all. Even with the heater closed off, it has to be radiating a lot of heat into the cabin. Anyone insulate their heater box? Not sure if that foil face insulation would be good inside the heater box. Thoughts?
https://www.homedepot.com/p/E-O-12-i...E&gclsrc=aw.ds