If you have tons of money you can do most anything.
Rebuilding your engine, which may require a new block as well
as the piston can be done but it will cost thousands. I would
keep searching for a used engine from a 97 GTP. Widen your
search to all of the US. You may have to have it shipped from
far away but a used engine with freight will still cost way less
than rebuilding yours. Whatever you do its going to cost a lot
and take weeks if not months to get your car back. If that
scenario works for you then go for it, if not its time to bid your
beloved car goodbye and move on to something newer. Well
cared for Supercharged GTPs are everywhere and are not
expensive. Good luck.