1974 as 12.3c Australian the US was paying less.
The average price of a gallon of regular leaded gasoline in 1975 was 57 cents (about $1.55 in today's dollars).
Leaded gas was banned in California in 1992.
In 1971, the average price per gallon of regular leaded gas was $.36 cents.
In 1971, the average price per gallon of regular leaded gas was $.36 cents.
If you managed to find any leaded gas then No, it will not hurt anything.
The engine originally ran on leaded gas (hence, no torque converter). Leaded gas is no longer available (in the US), but the vehicle will run well on unleaded.
In 1967, a gallon of regular gasoline (leaded in '67) cost 33 cents. That is equal to about $2.15 in 2010 dollars.
Leaded regular cost $1.19/gallon, while unleaded regular cost $1.25/gallon, and the average for all grades for the US in 1980 was $1.22/gallon.
Leaded gas started being phased out in the late 60's. Catatytic converters, which can only burn unleaded gas, were made mandatory in 1975, so that pretty much ended the production of leaded gas.
Leaded gasoline.
The average price of gas in 1975 was $0.567 per gallon
37 Cents for an Imperial gallon.