If it has cranking compression at 180-185 across all cylinders they took care of the compression drop when using 360 heads.
Before you tear into it, just get a cheap borescope. As already said, aftermarket pistons are stamped with a bore size and usually a part number. I have this one
https://www.amazon.com/DEPSTECH-Wat...pixels-Smartphone/dp/B01MYTHWK4?tag=fabo03-20
It's not the greatest, but it's still more than enough to read a stamping on a piston without taking anything apart.
