I've been very interested in this post since I just set up my Edelbrock 553 last fall. I can't speak from years of experience, but I can tell you what I've done. I originally bought all the rebuild parts from Charlie at Vintage Speed. I put new plates under the secondaries (without idle screws) and installed power valve plugs when I rebuilt them. I'd have to look back at the kit and invoice to see what size power valve I put in the primary. I had 5 carbs to choose from when I was rebuilding, but all of my carbs were the bigger 1 1/16" venturi. I installed everything onto the manifold and hooked up the progressive linkage, but I didn't get any further than that 3 years ago.
Last fall, I contacted Dick York (Dicks' Hot Rod Carbs) and talked to him about building fuel lines for me. I ended up sending him my manifold and carbs, and he proceeded to check over my rebuilds. He found a few things that I had done incorrectly (float levels, replaced the seal on the power valves and plugs to be compatible with ethanol fuels, and changed my jets). I had no idea what jets to use, so I just re-installed the jets that were there. I believe we went with .051 in the secondaries and .055 in the primary. (I may be wrong on that). He said Holley 94s should only ever have 1.0-1.5 psi and did mention that everyone will tell you different, including Charlie. [Both Charlie and Dick were amazingly knowledgeable and have years of experience in multi-carb setups.]
Aside from a few fuel leaks, re-clocking the distributor, and air cleaner fitment, the motor runs great in my 59 F100. It's been driven through town and down the highway. I've only put a couple hundred miles since winter set in on us. I'm running an MSD 8383. The vacuum source is from the base of the primary carb, modified using the information in Ted's article. The port in front of the primary carb is being used for the PCV.
Please excuse the picture. I pulled it off a video I took of it running. The valve covers will be replaced with Edelbrock covers in the spring.
For anyone looking to add a vacuum source, here's the link to Ted's article. I did this modification for the single 2-bbl Holley 94 on my 272 in the 55 Fairlane and the 3x2 Edelbrock 553.
http://www.eatonbalancing.com/blog/2010/02/07/modifying-the-holley-94-two-barrel-for-late-model-distributors/
Soffian Adam
Jamestown, NY
59 F100, 55 Club sedan