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The 6.2 and the Cummins are 2 totally different animals. The biggest diifference is that the 6.2's compression ratio is 21.5 : 1 and the Cummins is 17.5 : 1 - 18 : 1, but the 6.2 is also an indirect injection design (vs direct on the Cummins) and the 6.2 has uncoated, cast pistons vs forged in...
As long as you keep the EGT at 1000 or below, you will be fine. 1/4 is too much without a turbo, but you can usually get away with 1/8 of turn with stock 6.2.
THIS - except turn the screw counter-clockwise.
You turn up the fuel by taking off the small cover on the drivers side of the injection pump. It is very small, and has 2 screws holding it on. You will need to remove the throttle cable and bracket to see the cover. Once this cover is off...