Hell man...I meant ta go listen to the motor!!!
Bottom, left plug in the pic is the dead hole...
Stick jen's finger in that hole with it running and see if she can read the compression...otherwise use a compression gauge and see whatcha got.
Yer right...a dual plane manifold will show up slight variations in plug color based upon distance from the plenum to the combustion chamber, but that's inconsequential in the big picture. The rest of the plug colors look just right from here...all a bit Rich but we need to put on the gas analyzer to tell for sure.
Iirc the carb is either the oem-style afb or an edelbrock clone???
Since it'sa chrysler electronic ignition it'll fire right thru a big gob of crap on the plug electrode. And if one half the carb was grunged, the three cylinders on that plane would also be acting up.
With one dead/weak hole (and ya changed the badly fouled plug out with no change), I'd say it's compression/valve timing related. Check compression on the dead one and adjacent cylinder, also look for broken valve spring/sticking valve/bent pushrod...just like this stuff that affects the IH sv motors. Pop the valve cover and take a looksee at #1 stuff and tell us whatcha find compression-wise.
In this situation, I'd actually screw the compression gauge in and start the motor for an instant to see whatcha got.
If ya gotta vacuum gauge, rig that up also to manifold vacuum, if it's compression-related, the needle is gonna oscillate wildly.
I can't remember onna "b" block...is this the cylinder number sequence??:
cylinder numbering (from drivers seat, front to rear)
1-3-5-7 left, 2-4-6-8 right
and firing order is??:
1-8-4-3-6-5-7-2...same as an IH sv motor?
Oh yeah...is the miss a "dead miss" all the time??? Or does it seem to come alive once the revs come up? Have ya pulled the plug boot on that cylinder to verify it's dead even at higher rpm?
