Hey james!
Sorry for budding in on your thread.
drewvir was right, wiseco has pistons for your 235 but you will have to cut the skirt if you have gt. The wiseco are much better than oem. The stock pistons had the top ring to high, this in my mind caused the top of piston to explode making a mess of head and cyl.The wiseco piston has more than twice as much mat. above top ring.
Also check exhaust filler block bolts, they have a bad rep. for backing out and falling into cyl also. Good luck with the rebuild.
woody