Setup for 750DP on this 408

70DusterBob said
I think the jets are part of the idle circuit, are they?

Yes and no. :D
Yes in the sense that the fuel must go through the main jets before entering the idle circuit.
No because main jets are so big compared to the idle restrictions that changing the mains has little to no effect on the amount of fuel flowing through the idle circuit.

70DusterBob said
I know the cams increase, decrease or lengthen and shorten the amount and timing of the shot of the acc pumps. The squirters effect the amount of fuel dumped by the selected amount of pump shot.

70DusterBob said
And the power valves, I have gotten conflicting information. Some say go with 1/2 the idle vacuum amount for the numbered size of the power valve. But Others say, for more power increase the PV by like 2x one half of the vacuum, which would be at the vacuum full number.

Click on the link. It will take you to a diagram from a real carburetor book (one written for commerical and military automotive and aeronautical engineering).
Power Valve Selection: The Definitive Answer
See if that helps.

70DusterBob said
I am still not sure what the booster is or how it works, what it effects, or if it can be changed.

The boosters are minitaure venturis. Venturis are sort of an hourglass shaped tube. The air speeds up through the narrow section. Having a second venturi within the big venturi increases the air velocity even more.
The air rushing past the booster pulls the fuel.
It's kindof like having an airplane wing that is held in place. The air rushing past the wing would lift it, if it could.
The booster is connected to the fuel supply in the bowl. Instead of the wing being lifted, the fuel is lifted.
An analogy Chrysler used in 1970 was a bug or paint sprayer.
Check it out here on this page.
Carburetion Fundamentals & Facts (Session 273) from the Master Technician's Service Conference