350 crusader pops and miss after 20 min cruising speed

by webb polite
(springfield La USA)

one engine will pop and miss lose power after 20 min of cruising speed i have swapped carbs changed plugs wires coil and distributor motor only has 145 hrs bought as long block also exhuast is new. twins in 30 ft 1985 carver,also new spark plugs. thanks for any advise.

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