where's the truck? K3500 or C3500?
Putting in a 350 would be like equipping a Peterbilt 379 with a volkswagon
Jetta engine. Putting in a 454 would net you some torque, but not be cost
effective to swap. Replacing the 6.5 with a long block, installing a few
aftermarket parts in the right places and sticking to what belongs in the
truck would net you a great tow vehicle. I doubt you will see 300HP and
+520 ft-lbs of torque getting +15 mpg with a 454.
easier just to buy a gas engine, even though i could have got the 3500 for
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