No.... you don't need the blocks, but like many things in life, there's an easy way, and a hard way. Running the left side of the tractor, and the plow's depth wheels up on blocks on a hard level surface, and then adjusting the plow level is about the easiest way to set one, or at least the easiest way I've found. Five minutes and it's done, or you can spend an hour in the field guessing at where it's at. Technically speaking, the block height used should be the same as the plowing depth, which should be 1/2 the bottom width.
I'd be lieing if I said I never fine tuned a plow in the field too, but this method does get them pretty close. I often play with the top link and the front furrow once I'm in the field, and continue to play with the front furrow on side hills to get the plow pulling straight.The most important thing to remember with any plow is to get the beams perpendicular, and level front to back. You also need to set the plow so that it pulls centered behind the tractor. If it's pulling hard to one side or the other, it's not set right. That could be a front furrow width adjustment, or a wheel spacing adjustment, or a headstock adjustment... Just keep it level and centered. That's the critical thing..... Rod
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