Who knows? I'm sure that's why the op is looking for info.
Full skirt. How much ovality? How much barrel? More measurements are required to make an educated guess.
I took out an ancient set of full skirt pistons like those from a maxwedge that was running OVER .010 p to w. (.060 over)
I honed it a little, and put standard 440 pistons in it (.070).
I would not run those M/T pistons any less than .005.
