I swapped engines in my 64 fairlane, replaced a 390 with a 427. I used the coil and distributor from the 390 on the 427 to get it up and running. The engine starts just fine and seems to run well after the swap. But, after being on the road for maybe 5 to ten miles, the engine stops running. It has gas. Then, after 5 minutes or so, it starts right up easily but after another 5 miles or so, the engine just stops. Pull over , let it sit, it starts right up. any suggestions, please and thanks.