The spark plug gap is ( .044 inch )
.035
.035 inch ( for the 302 / 360 / 390 cubic inch V8 engines )
.050
According to the Chilton's Collector's Edition 1972-1979 Auto Repair Manual, the 302 is a 1972 motor and the point gap is .017. The point dwell is 26-30 degrees.
The gap on the plugs is .034.
The year of the motor is 1985? Then it is not a Mercury Force. Also with the plugs that it takes, there is no gap adjustment,
The answer is .044
The spark plug gap range for the non-Boss 302 is 0.032"-0.036".
( .035 inch ) is the spark plug gap
gap it to 44
.044 inch
Let me know the type of heads you are putting on the 302 and if they are 2V or 4V heads and if possible what type of vehicle was this 302 originally in. Spark plug gap for my 2V truck is .044