I am new to the forum and am looking for some help. I just picked up a Everett Morrison 1967 Cobra replica that has a Ford 390 FE in it. It sounds like it is not running on all cylinders so I took off the plug wires one by one off the distributor cap and on cylinders 1, 4, 6 & 7 it did not make any difference if the plug wire was removed. This does not seem right, as when I remove the other plug wires the motor bogs down. I tested to see if I was getting spark at the end of each of the plug wires and swapped in new plugs but nothing is changing. Any suggestions on what is going on or what I can try next? Thank you so much