That is odd. Maybe someone wanted more travel and removed the cushions or maybe the old ones gave up the ghost and a previous owner couldn't find a replacement. Anyway, without the cushion the A arm is dropping about as far as it can so don't think there is much more clearance to be had from that end unless something is disassembled. Possibly removing what is there would give another tiny bit but maybe not.
Troy made reproductions of the J-6065 tool but since he closed his shop I don't know if any of the other vendors picked up his inventory. Only ad I can remember seeing for the tool is from Dwight Heinmuller. If the load arm end is not as high as is shown in the service manual illustration with the tool in place and you can't raise it any more with the chain, maybe a tool would be a good investment.
https://www.packardparts.org/products/parts/torsion-level-suspension/ Hopefully Ross will come along with another option and save the day.
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