@3Dave - If I was planning on keeping the car, I might think about doing something like that. As it stands, I'm just trying to get it running and on the road so I can sell it.
@3Dave - I did end up buying the shortblock. It looks to be in pretty good shape. There was a little bit of rust in the upper cylinder walls where it was sitting out in the elements. Nothing a little honing won't take care of, though. It turns over freely by hand. I will need to drill/tap the holes for the lifter spider and for the cam plate. It has bosses for these, but since this was a flat tappet cam'd block, they were never machined in.
I haven't taken the pan off yet. I'm hoping it's a 4-bolt main. Would be an awesome find.
The only thing I'm seeing right off the bat was the Amazon one has (what appears to be) an oil pan gasket ... not sure though. There's the large piece which is missing from the Summit Racing one.