1969 Dodge Dart Engine Stutter
The condition of of the plugs you pictured appear to be OK, but that is not the correct plug for a stock 273. I believe most of the forum members use Champion RN12YC
This will help
Spark plug reading can be complex and sometimes frustrating task this page will help make it easier and the results rewarding
Do you have electronic ignition?
Your second issue is the fuel old school engines like your do not like ethanol in their fuel it not only makes them run poorly it will destroy all the rubber parts in the fuel system and create serious problems. Premium non ethanol fuel with an octane rating of 91 or above would be preferred.
