In a previous post, I told how I cut a bundle of three wires going to what I thought was the shut-off valve. That was not the shut-off valve at all, but a diaphragm actuated switch of some sort on the engine side of the injector pump, IP. I suspect that this may be the reason for the jerky shifts.

I read in some other threads that the shut-off valve mechanism is between the IP and the oil filter, . Sure enough, I was looking at the wrong thing. Now what to do about the wires I mistakenly cut?

I am happy to report on the troubleshooting test I did. A hand vacuum pump plugged in to the nipple on the "shut off valve" caused the running engine to stop cold with just two squeezes of the hand pump! The vacuum gage showed less than 10" of Hg. Also, there was no sign of oil in the vacuum line, it was dry. I think that means the next step is to look for a problem at the ignition switch/vacuum valve.
Any other suggestions on how to proceed? Must I drop the cover from under the dash near the ignition switch? Thanks for your help!!