There are a couple of sites where the answer differs slightly. One has the gap set for .024 and the other says .028 Common sense says play the field and gap at .026 but that's just an uneducated guess. I'm going to try it.
.024
.040
.040
.028"
The spark plug gap range for the non-Boss 302 is 0.032"-0.036".
.024...... seems tight, but that is what it is. .028 if it was Fuel injected, 1969? Isn't fuel Injected...so .024.
It is .004
.035
Here are the engines that came in the 1969 Plymouth roadrunner,so the spark plug gap is the same for all. I sure would like to see it.1969 Plymouth Roadrunner 6.3L 4BL HP 8cylThe Spark Plug Gap.035 (In thousandths of an inch)1969 Plymouth Roadrunner 7.0L 4BL 2 Carb 8cylThe Spark Plug Gap.035 (In thousandths of an inch)1969 Plymouth Roadrunner 7.2L 4BL 8cylThe Spark Plug Gap.035 (In thousandths of an inch)
Between 0.025 and 0.028 is recommended.
According to one of Fords websites : For a 1969 Mercury Cougar ( all factory available engine sizes ) ( .035 inch spark plug gap )
.045