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4 tons of gypsum to start on an acre should help to loosen the soil. You may need more gypsum than that but you can apply it over a couple of years. You also will get calcium out of the gyp, fruit trees are calcium whores
Elemental sulfur will drop your ph. Your soil test should give you the amount of sulfur to get your ph down to desired levels.
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I'd also lay out the planting rows, work them deep with a turning plow and apply/turn the gypsum in only those rows.
You could also see if a tree trimming company can dump you a load of woodchips that you could compost then add to the rows to give them some organic matter. It improves the tilth of the soil.
Gypsum breaks up the clay and provides good drainage, I've used it here with great success. I used to go to my local Lowe's and get the "stickers" that are used under the bundles of sheetrock. I'd leave them in a pile out in the weather and allow them to break down a little then spread them and rototill it into the soil. Worked perfectly.
I have a tree company that contracts with the local electric utility keeping the rights of way clear. I set up a spot for them to dump their chips for free and I usually have 20,000 to 40,000 cubic feet of woodchips composting in various stages of decomposition.
The chips break down into rich dark soil.
I turn the piles with a front end loader and mix some old stuff with the new stuff to get the microbial action going and to try and keep the piles at a certain moisture content.
When viewing the piles on a cool or cold morning and there's steam plume above them, all is well.
I've planted in this woodchip soil for several years and it produces excellent cukes, squash, tomatoes, sunflowers, beans, peppers, lettuce, cabbages, kale and collards.
Start amending your pasture in the local spots where you want to plant the fruit trees first and work out from there. Everything beyond the drip line of the trees is just going to be grass you'll have to mow so concentrate on the tree locations.
When planting the trees dig a big hole and apply lots of well composted manure to give the tree some nutrient and a loosened area for the roots to expand out into.