You can always buy the Mojave heater from Summit. Hang it right above your console behind the dash. I made one for my 70 Charger and it was blowing air at 3 speeds, and had the optional vent on the side to hook up to the dash defrost vents. I think it was like $120. Weighed 14lbs when it was filled with water. A heck of allot better than the 80lb factory unit and your firewall has allot more space. I opted to hang all my MSD ignition on the passenger side firewall and an updated fusebox