Ah. What I did?
My solution evolved from using the Weber 48 ida carbs.
I drilled and tapped into the carb mounting flanges. On the Hall manifold, they are very thick. I threaded in a -3 JIC male to 1/8"NPT adapter. Then used a -3 JIC T fitting running 3/16" stainless brake tubing from port to port. Flared tubing ends with tubing nuts and ferrels.
At the time there was a Mr.Gasket fuel log that fit in nicely just at the back of the intake manifold, near the top of the bell housing. There is a picture here of it installed that I included but you really can't see much of it, but that was my thinking, i.e., to minimize everything.
I ran the left side tubing to the left end of the log. The right side to the right side of the log.
This gave me four 3/8npt ports on top to use as vacuum accessory connections. I tried to use it as a vacuum source for the power brake booster but the IR system doesn't produce enough volume of vacuum for the brakes, but it is fine for a vacuum gauge and now is used also for the MAP sensor.
I'm using a Compcams vacuum pump for the brakes so there is no issue with not enough vacuum now.
On my set up, David's vacuum block would be in the way of my throttle linkage and using the Hall Pantera intake manifold, it has a cast in throttle tower for the throttle pivot.
It looks like you are likely already comited to using the ports drilled into your intake for the NOS but you can eliminate the vacuum block and gain some much needed room?
Here are some pictures. The top view is of the original setup with the Webers which I replaced with the throttle bodies. The vacuum plumbing is still there. The throttle connections are essentially still the same.
You can see a portion of the vacuum tube plumbing with the t-fittings which will give you a pretty good idea what they all look like.
The large -10 Hoses in the view from the top picture were removed. Those were initially intended for vacuum for the power brakes but that didn't work out.
The thought on the top picture was never to illustrate the vacuum plumbing. The combination of all of these pictures should give you an idea of how I try to tuck everything in.
The pictures would suggest that there is miles of space to work in and run hose and tubing, which really is the farthest thing from the truth in actuality?
I hope some of this helps?
With the FAST system, the CPU automatically compensates for the A/C compressor running and raises the idle speed, so with it I don't need an idle air control system separately. The combination of the sensors tell the CPU that the A/C is on and to raise the rpm. I think the number is it raises it 75rpm? Offhand I forget the exact compensation, but it works and it is adequate, and one less additional device to add onto something there is no space left for?
That's fine by me.
