I agree with HRL, the 400 small block would not be my choice for a hard working truck. It would provide a nice torque range but not at the price of other issues it historically has. A well built 350 or 383 would be the least expensive and very reliable.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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