I've been tracking down intake leaks for a while now. As it turns out a simple plug reading shows the Carter AFB is running lean on one side. So I decided to go through the carb again and give it another deep cleaning and fresh gaskets. But before I got into it I pulled the spacer off to see what I could see and I found this;
So the PO had tried to adapt the AFB to the 4350 manifold by sandwiching a 4350 fat gasket and an AFB insulator.
But that's it;
4350 fat gasket-
In the last pic you can see where they weren't sealing tight along the left side. Which would explain the white spark plugs on cylinders 2,3,5 & 8.
Now, according to this writeup
there's only one adapter in the known universe that'll do the job right ($65 @ SummitRacing.com). Roughly the same for the gasket set to replace the original manifold and carb (more work). I kinda like the idea of being able to mash the pedal down and getting a legitimate response from the motor but I've heard some pretty negative references to carb adapters in general. And I need to get this ol girl to pass smog here in AZ.
Dad says to swap in the stocker, but I'm leaning the other way. I'm having a tough time deciding which direction to go with this.