Mike,

I believe the fresh air intake for my truck is in the cab at the drivers cab corner. I will shoot a picture when I get a chance.

Thanks for the other info, I will look and see what I see regards the firewall.

Thanks,

BaconFarms

1948 GMC 2 Ton
1958 GMC 370-8
1965 GMC 5000
1970 Chevrolet C50