Yeah, I was scouting out the tool on Scamazon last night. It doesn't look like AutoZone rents it, which is a shame, but it's only like $60 to buy.
As far as sludge, yeah... kind of gross, but the pickup screen was at least totally clean. The top of the heads are sludge-free, so.... yay.
I did call a local machine shop yesterday, to get a ballpark price on getting the heads cleaned in their hotwash tank, and surface skimmed. They said $150 for a basic service (both heads), and up to $400 if I need them to do the basic service plus a valve job and new spring installation. This was before I pulled the cam, so I'll probably see what it costs to clean the block as well.
Taking a break tonight to do some other stuff, but I guess I'll pull the main caps and crankshaft out. I was hoping the cam bearings would look gorgeous, but.... in for a penny/in for a pound.
I should probably build a little spreadsheet to track time, money, and hopes/dreams for this.