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Your GMC will be positive ground. Your statement is correct.
Have you turned the engine over by hand? I would put some light oil in the cylinders and turn it several times by hand before turning it with the starter. Then I'd do a compression check before trying to start it.
When you fire it up have a helper observing. Your carb will probably leak.
The choke knob limits the amount of air going thru the carb. It is used for starting the engine. The throttle knob is used to hold the engine revved up, like when running something off a PTO. You'll probably never use it.
You should also check out oldGMCtrucks.com.
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