I just picked up a Rockwell Unisaw model 34-461, 3hp single phase, 3450 rpm. The original fence leaves much to be desired (I did receive 2 fences and 3 miter gauges with the saw).
I posted pics of this saw in my photo album, Pete's tools.
I have a 50" Unifence on my Craftsman T/S and if I could find another set of rails for that fence, I'd mount them on the 46-641 & switch the fence from table to table. The rails don't need to be 50".
Still, if someone has a Biese they want to get rid of for a reasonable price, I would go that route.
Email me with pics & price.