I think you bring up an interesting point with it having front to back common and side to side isolated... My tunnel ram is wide open to all eight from anywhere... Either way I think it's still allows for progressive carburetors if that's what you want... Now if it was isolated front to back obviously that would be a different scenario...
I went back and forth with progressive and one to one and ended up in the long run just leaving it one to one...
These are some old photos from 5 or 6 years ago. You can notice on the rear carburetor I have a little extra space for under the air cleaner to make it pop up above the front one to get a little of that direct air...
The first picture I'll post is of the reason I didn't want to do the sideways mounted carburetor the linkages much more elaborate...
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1 here you can see where I attached a slider to the front carburetor. But I attached it a little lower than the rear carburetor has to give it a quicker throw...
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2 here I'm just pointing at a stop that pushes the front carburetor throttle back close but both should be spring loaded anyways it's just a safety measure.
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3 okay a few things to notice here but I'm pointing at the throttle stop for the front carburetor or should I say throttle go LOL..
This is in the closed throttle position and that stop that I'm pointing at is set in the full throttle position when both are pushed all the way back. You can see now how much throttle you get on the rear carburetor before the front one starts grabbing but since it's point of contact is closer to the fulcrum point it will catch up and be full throttle at the same time as the rear carburetor...
Making your true adjustment being how far you put it from the fulcrum point...
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4 hear my pointer finger is right on top of where the rear carburetor is connected and basically all you have to do is put that bolt in that position and put your stop right up against the spot where my middle fingers pointing and you'll have one to one..
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This is just simple everyday buy it anywhere dual quad linkage for 20 bucks or so...
You may or may not also notice the rear carburetor is an old competition series and the front one is a 1406... The car ran great with that setup..
But I had to go new and fancy and got some Holley Street demons... I got them on a Christmas sale and by the time I sold these carburetors I think I was into the new ones about $250 or less... What I did for the 750 Street demon on my truck was got put on a waiting list with Holley for a factory second and paid half price for basically a new carburetor.. which one I opened it up to set the float bowls and had some trash in it and I told Holley and they sent me a brand new one..
I don't know if I would recommend the Holley Street demon for dual quads though as they do not have as many options for jetting as edelbrocks that have been around many years. They were never made for a dual quad setup...
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