The Craiglist ad says that he wanted to stuff it into a Packard street rod but he didn't because he couldn't find a flex plate for an automatic transmission.
He is technically correct, but completely wrong at the same time.
There are no commercially available auto flex plates for for a LT5.
It is possible to modify a small block flex plate to fit a LT5, as evidenced by the handful of ZR1 guys who have put autos in their ZR1s.
Personally, I think his story is weak.
My bet is that he bought it on a whim thinking he was going to turn it quickly for big bucks.
I do like the polishing job.
That motor looks fantastic on the engine stand.
Wouldn't mind having it in my family room (wifey would probably object to it though).