Might take a bit to bleed all the air from the system, and it will indeed sound like hell and run badly until then. It may not even be running on all cylinders yet. Do you have a clear piece of tubing on the fuel return, to check for air bubbles?

How's the rest of the engine? When were valves adjusted, glow plugs in good order?

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap