[DDS]

Is there something wrong with the engine other than the suspicious pistons? Does it run? What is the bore? You may actually have lighter or maybe longer than stock rods, which is kind of cool, and they may be useable for a stroker crank which is even cooler.
Are there big spacers under the cylinders or anything weird like that?
Was it a low bucks effort?
If you want to un-build it, you'd need a crank and rods for sure, and to check the pushrod length and verify if the heads were flycut as this changes valve geometry and CR too. Case shouldn't be more doubtful than normal.

Dave