I just used an Adjustable Wrench to turn the Tap a little at a Time until it was tapped far enough  to screw a Bolt in.. 

  

You can use something like this:
https://www.lislecorp.com/specialty-tools/tap-socket-set

I have this one and they do not fit all taps but it is handy when it does.  Uses 1/4" or 3/8" drive tools so a ratchet or T-handle and extensions should do the job.


Lawrenceville, GA

I got the tube out today.Thanks for all the advice. I had to drill it from from both sides. I got the side with the hole tapped but the side with the mushroon is a problem My tap isn't long enough and a couple of the intake ports are in the way when trying to turn the tap.How did you beat that problem?

When Injustice Becomes Law, Resistance Becomes Duty

The "B" intake I have had a rusted thru choke heat tube & trying to drive it out didn't work. Ended up drilling from each end, it was a bit of a project. Because I'm in the northern latitudes decided to replace it, but no stock appeared to be available. So, I substituted 1/4" copper tubing.with a small soldered on cover on the one end, with a small opening in the bottom. But, haven't put it in service yet, so can't say if it's satisfactory...    


Paul

Just like mentioned above. The tube comes out fairly easily but it will most likely come out in pieces like it did for me. The mushroom cap can be pried off. This needs to be done before you install the manifold.


~DJ~ AKA "Bleach"
1956 Ford Fairlane Town Sedan 30K original miles

As long as the tube isn't rusted, it poses no problem. It only passes through the exhaust crossover chamber and the vacuum choke sucked warmed air through it. If it burns out and leaks, you will get a "tick-tick" noise from the exhaust. It is just a press fit in the manifold and cam be driven out for replacement. 

I simply drilled and tapped both sides and screwed a bolt into each opening to seal it. Might have been 3/8 Diameter. No way I would have a Vacuum Leak after that. Power for the Choke is a fused Wire direct from Ignition Switch.

  

I just got another ECZ 9425 B to build another 4 BBL set up for my 312 in case I want to take the tri-power off. I had one before but like a dummy, I sold it.I will use a Holley 390 CFM model 4160, p/n 0-8007. This carb has an electric choke so I don't need a manifold choke tube. The Manifild has the choke tube with an open hole on one side and a mushroom like thing on the other side. My question is is it OK to leave the tube in or should I remove it? If I should remove it, how is that done? Also, I looked all over the site for a search box so I could research the topic before I asked the question. I'm pretty sure it has been asked before. However, I couldn't find a search box anywhere. I know there is one because I have used it before. Anyway, any help would be greatly appreciated. Thanks!

When Injustice Becomes Law, Resistance Becomes Duty