Here's some #'s for you from "Chevrolet Pickups 1946-1972" by John Gunnell:
Total 1968 production of pickups and vans C, K and G series is 485123 units. Of that # approx 4% were CST's. Also of that total, 46,483 were fleetside swb pickups.
So following that thru, 4% of 46483 is 1859 SWB Fleetside CST units. How many with BB? Anybodys guess, but a CST did not automatically come with it. If you figure 25% of those CST SWB Fleetsides had the BB installed your truck is indeed rare based upon percentage of total production. It is one of 465 units by my guestimates.
The 68 396 was rated at 325 hp @ 4800 rpm. It has a 10.25:1 compression ratio. Again this info is from same book. That color is Meduim blue poly.
If it were mine, I'd treat it as a stock resto given it's apparent rarity and desireability. Any other treatment would be a crime IMO.
Of course, this is from a guy would would do a stock rebuilt on any vehicle regardless, so take it for what its worth.
I'd like to see a pic of the option sticker. 
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Currently on or near the homestead:
67 Chevy SWB 2WD stepside 350/3 on tree (Pat's)
67 GMC SWB 2WD Fleet 402/auto (Brian's under construction)
67 Chevy 3/4 ton 2WD 402/auto (Business Hauler)
67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC)
68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC)
70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC)
71 Chevy SWB stepside (Crushed by tree - parts donor)
72 Chevy 3/4 ton 4WD (Parts donor)
72 Chevy 3/4 ton 4WD Suburban (Parts Donor)
72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC)
81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler)
82 Camaro Z/28 355/Super T-10 (Pat's toy)
93 Caprice 9C1 (Brian's Cop Car)
02 Toyota Camry (Reliable but a souless steel and plastic hulk)
2011 2SS RS Camaro M6 Factory Hurst Shifter 
Maybe I need to sell some of this crap 
Yet another Bozo with a sawz-all
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