Just bought my '66 Dart and have some questions!
for an interior heater, I use a metal 5-gallon can (like a lacquer thinner can, which I have plenty of) I cut the top off and make a cross out of scrap chunks of 2x4. Mount a cheap light fixture to it, (cheapest one you can find at the hardware store) add a cord and a light bulb, poke 4 holes about an inch square around the bottom. Turn it over and plug it in and away you go. I use a 100-300watt bulb, whatever I can fit in there, and it keeps the moisture out of the car (long term storage) or keeps it a bit warmer in the winter. This is pretty cheap to make and pretty safe in the car. I keep one in my wife's 68 Mustang all winter and have never had a problem with it. I slide the pass seat fwd, tilt it fwd, and put the heater on the floor in the back seat. I used to keep one in my boat all winter long as well and never had any mold problems. I'm in Seattle so not quite as cold but real wet!
for an interior heater, I use a metal 5-gallon can (like a lacquer thinner can, which I have plenty of) I cut the top off and make a cross out of scrap chunks of 2x4. Mount a cheap light fixture to it, (cheapest one you can find at the hardware store) add a cord and a light bulb, poke 4 holes about an inch square around the bottom. Turn it over and plug it in and away you go. I use a 100-300watt bulb, whatever I can fit in there, and it keeps the moisture out of the car (long term storage) or keeps it a bit warmer in the winter. This is pretty cheap to make and pretty safe in the car. I keep one in my wife's 68 Mustang all winter and have never had a problem with it. I slide the pass seat fwd, tilt it fwd, and put the heater on the floor in the back seat. I used to keep one in my boat all winter long as well and never had any mold problems. I'm in Seattle so not quite as cold but real wet!