The 1966 GTO was my all time favorite. I love that car, especially convertible.For a time when I drag raced my 1966 GTO, I used to place thin brass screening between my carb and my manifold. I was turbocharged so the air resistance was not important (and my competition sucked so a 7-10% loss in flow was acceptable). I was worried about turbo pieces getting into the engine. Occasionally I would find all kinds of crap in there.
I was always surprised the screen caught the pieces vs. tearing.
I feel your pain BUT, at least it is a piston and not a scored cylinder or destroyed head unit from a valve bending and then screwing everything up.
Time to look for piston replacements though, and that will be hard unless you find something else that will fit as TOYO stuff is becoming unobtainium.