Posting some follow up info in case it can help others in the future.
I've continued to do a little bit of cleanup (mostly dried grease) and evaluation. I'm pretty sure I'm going to have to replace the two wide belts on the Worthington drive system. It works, but one of the belts has stretched more than the other (left in position for years) so it's got a bit of hop and will start to slip at higher speeds. I'll have to remove the drive system to do that, but there's enough room it shouldn't be much of an issue.
I wasn't sure what size machine vise to get for it and was torn between a 4" and 3". I went with the 4" and it's about as big as you would want and wouldn't really work well for the older versions with just a central T-slot in the middle of the table. Mounted to the middle T-slot the vise would stick much too far back towards the column and you'd lose a lot of travel.
Lastly, when I went to remove the arbor it was stuck, stuck, stuck! I've read this is a common issue with the B&S #9 taper. Rather than beat the tar out of it with a big hammer I made two wedges (like those used to remove drill chucks from arbors) and using hammers on opposite sides the arbor popped free in about a minute...easy, peasy! I'll follow up with pics of the wedges later tonight.
Here are some pictures of the Worthington drive since there aren't many posted online. This was before I cleaned up the dried lube, chips and then added fresh grease. This was, by far, the dirtiest part of the machine...win for me! You'll notice the rubber drive belt for the speedometer is off...it was pretty dry and loose. I bought some 5mm textured thermoplastic polyurethane drive belting off eBay for $10...cut to length, melt and stick together...seems to work perfectly.
Here are pics of the vise just set in place for reference. The vise was only $79 (not pictured is the swivel base) from CME in Madison Heights, MI....seems to move really smooth and the machining on the surfaces is actually quite nice.
