73 Duster motor shake

1973 Plymouth duster factory 318 car has 53,000 miles took off the two barrel put on a four barrel brand new distributor brand new plugs wires everything is new. The timing is dead on the car has great compression for the first 30 seconds. The car runs great and smooth once it warms up the whole entire motor shakes and the car shakes, like I said, it’s not a miss it’s a shake

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