Yep. The Dual Fulcrum vibrato really is a work of art in my view. I can (just) squeeze out a full octave down drop from the low 'E' and still have the thing return to pitch. I almost never see the (unique to the early models) bar included when these come up for sale so you really scored well with this purchase.
BTW your SC-2 will work well with .010-.046" string sets
if you so desire, but will require standard setup tweaks to account for the increased tension (small adjustments to intonation, truss rod, possibly saddle height, and tightening the spring claw in the back of the guitar which determines the spring tension/resting bridge position/how far the bridge is able to 'float').
I use .011-.050 on my old SC-3 (with the same DF Vibrato) and it dials in perfect - there was
just enough tension in the stock springs to get the bridge plate sitting level.
The G&L Setup guides and the recommended measurements therein really are exceptionally good. Well worth breaking out the feeler gauges, hex keys and screwdrivers.
Enjoy that wonderful guitar

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Thx Andy. I appreciate your insights. I had no problem setting up the bridge/trem with either set. The neck has a bit more relief than I'd like and I adjusted the truss rod, but got limited response. It is pretty much maxed out and didn't want to force it. So the relief is better with 9-42 than with 10-46. It is still very playable and no buzz so i will settle for this. I'd stick a new neck on it if it worsens, but I otherwise love the frets and the feel of the original neck, and the headstock, so would like to preserve its originality as much as possible.