Start calling. While the aftermarket production of parts is excellent, they don't know everything about every vehicle and option. It may be they have the correct part, or are unaware there is a difference. Either way, you need a remedy and I wouldn't start buying parts until Painless is unable to help (even so they may be able to tell you what to buy).
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'68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.
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