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leave the motor alone...
swap to lower gears and/or smaller diameter tires....
your fighting a heavy vehicle weight with a likely tired/worn motor....
the deeper gears multiples the flywheel TQ which means less load on the motor accelerating the truck weight so it will last longer...
300ft/lbs x 2.46 first gear x 3.25 rear gears=2400ft/lbs on the tires...
300 x 2.46 x 4.10 rear gears=3,000ft/lbs on the tires
my $.02
you will spend $2000 on the motor for what a $600 gear change will do because of the weight...
when it's worn to the point that oil consumption is a problem,,,then address modifying or better, changing to a bigger motor,,,there's only so much a 300 cube can do....
strip every last pound off the truck you can...
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