What to expect after flat tappet lobe failure.

Good morning,

I've come across a Duster for sale with a w2 econo head engine for sale. The car is listed as a project car due to having lost a cam lobe, thus needing a tear down. Engine is a 410 stroker with k1 crank and rods, diamond pistons, built with decent parts. Engine has 500 miles on it then lost a lobe. Once this occurred it was driven home a couple miles then shut off.

My question is, from your experiences given this information what should one expect to find as far as collateral damage inside? I realize nobody has a crystal ball, just looking for experienced input. I'm considering purchasing due to the parts that went into the build, but worry about crank, piston damage etc. Has sat several years since this occurred. Great parts here, and I fully understand it needs a 100% complete rear down and inspection.