Got this done this weekend. Used the trailer to haul a couple beds to the Salvation Army and take a 45 min or so interstate test drive. It's WAAAY happier on the 3.36 than it was on the 2.94. It's not a huge bump, but the 600 RPM bump at 70 means it's got enough juice to maintain and gain a few mph on medium grades without a downshift, vs being under 2000 RPM where, if you farted in my general direction on even the slightest hill, the needle on the speedo was going backwards.
It was, generally speaking, a straight-forward swap. Not a spec of real rust (a bit of surface rust on stuff like the exhaust and flanges here and there), most of the nuts and bolts look brand new, which was nice. 3 hours spent and I have a happier tow pig.
Cool! Nice work!