I'm about an hour north of you, and when I had the same need (albeit for an EFI 460 I wanted to store, not a slant 6) and couldn't find anything decent on CL, I talked with my neighbor (a retired GM mechanic) and bought an Eastwood "EZ Turn" stand and never looked back. Glad I did, too, as I've used the hell out of it and it's never let me down.
Right now I have mis-centered 318 hanging on it (it rotates unevenly), and it didn't even sag when I bolted-it on. Not inexpensive, but it's the best engine stand I've ever owned/used.
[/URL]