I would flip the governor back over then........

try this link: http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0678.htm

Although it doesn't mention any vacuum lines....so perhaps you have a different beast. Is the governor open or closed with the way it was hooked up.....how about if you hook it up correctly? Does your distributor have ports on it for the air lines to run to and from?

My '60 IH has a line for filtered air at the carb to the distributor and then a line to the governor that is integral on the carb. From the description in the manual it sounds like the factory setup does not use air lines or distributor for the governing.

Tad

1946 Chevy OS 1.5ton, 1955 GMC 3100, along with other various IH,Ford,Nash,MGB,.....