Kurt

A couple of things your doing don't seem right to me--might just be my mis understanding of what has been written, but---

It sounds as tho you have the car weight setting on the wheels on ramps----you will need the rear end to be hanging to do this job--the factory puts the rears up after al the tanks and exhaust

Second and maybe more important----I don't think the fuel pump is your problem--I have started these vehicles on not only starting fluid but once with my Mother in laws hair spray and got them running---low pressure will continue to run and it should run fine with 40# you say you have----
The symphons as you state them seem to me that the cam sensor did not fix the original problem or is once again acting up which might indicate that you haven went far enough with that repair--

I always go back to the last repair done when something shows up later that could possibly be the same