[steelcomp]

Michael,
Leave the 5cc accelerator pump the way it is. You might go to a smaller nozzle which will give you a little less gas, but over a longet duration, and nyou can play with pump cams as well, but you need the big pump...it's feeding all four venturies at the same time. It's no different than a double pumper, since primaries and secondaries are coming in at the same time. You're not going to get very good drivability with these, but they ought to work good under WOT.

The 1850 600Vac sec. carb will be jetted good enough out of the box. What you want to do is open up the power valve passages about .010-.015" more than stock, and re spring your vac. sec. diaphragm to get the secondaries full open by 3000rpm. You can buy spring kits for them, or just cut 1 1/2 coils off the stock springs. A balance tube between the diaphragms is a good idea as well, but not necessary. You won't be disappointed in these carbs when they're set up right. And they'll be very driveable!
Just my thoughts.