My /6 is a gas pig when it's cold outside. Why?

In addition to the good comments above, you have to understand that the years from about 73 onwards ARE THE WORST YEARS for runnability / drivability if the rig still has the original "smog" distributor, carburetor and "other stuff." These cars were typically so cold blooded it was unbelieveable.

1....You do NOT want a stat "as cold as" 180. You want AT LEAST a 180, and these cars came from the factory with a 190-195

2....The timing advance system SUCKS. Download the 73 shop manual......free......at MyMopar and read the emissions and electrical sections. Consider re-curving the distributor or even buying a performance one. No, I don't know what is available for a slant

3....Check over all the smog stuff. Electric choke control. Choke settings, and make sure it's not gummed up. Disable the vacuum advance smog controls if they have not been. Your factory timing setting WAS FOR ONE THING..........smog control, and nobody cared "how it ran" except the hapless owner

4...Carb.......I "ain't" expert on slant carbs. I would consider getting an older "pre smog" carb. Actually, anything built 68 and later Federally is a "smog" part, but it gets worse and worse as the years went on.

5...Carb "snorkel" heat.......These cars originally came with an air cleaner bonnet heat system. Again, read the manual, make sure that is working.