I am a bit out of turn here due to lack of truck engine carb knowledge but if I get your question right you are not sure if the secondary's are opening and thus causing your power problems? On the vacuum secondary Holleys that were used on cars there was a slotted cam and link under the vacuum diaphragm that served to pull the secondarys closed when you let off the throttle. An old hot rodder trick was to put a screw in that slot so the link to the throttle shaft would also jerk the secondarys open mechanically. With no accelerator pump back there it will cause a bit of a stumble whenyou mash the throttle but it will answer your questions as to if they are not opening and causing your problems.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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