After speaking with Cliff, I have ordered a rebuild kit for the used 17154923 2658 carb.
I will save the NOS carb for a different build (probably the 396 for my Chevelle).
If you were wondering I'm building a little 350 for my 68 C10 short bed 2wd
Really nothin special:
350 4 bolt, .060 over
204/214 cam
185 heads:1.72/1.50 valves with 70cc chambers,
a little light port work and a good 3 angle valve job
flat top hypereutectic pistons W/4 valve reliefs
compression 9.5:1 ish
quench: .035ish
1969 "hot slot" manifold, with the ports tapped and plugged.
stock rams horn manifolds, 1¾ dual exhaust with glasspacks and no balance pipe (might add one)
SM465 4-speed granny-tranny
and some gears out back I haven't checked, They kinda run like 3.73s (probably somewhere in that neighborhood)
just a little putt around truck, maybe haul a motorcycle on occasion, some mulch in the spring.