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No doubt, runs like crap.

It is coming in too soon. If you insert the mity-vac or vacuum gauge with T- inline, you can see what is happening to the ported vacuum. There is a release trigger on a mity-vac that will bleed the vacuum for testing. Tekslk, has a good idea, but the mity-vac will give you the numbers you need...

I think you are getting too much vacuum advance. When the throttle is cracked the ported vacuum comes in, the advance speeds up the RPM. When you open the throttle more the vacuum drops reducing advance, and that works. If there is screw in the vacuum advance you can adjust to limit the...

Here is the pressure sender/switch PN 53030493, to replace A and B with C. This is from the Allpar site. The single sensor gets rid of plumbing extension, reducing potential vibration problems. There may be a vibration mode that will shake the sensor. I agree with others, the temperature...

There are integrated senders with 3 terminals that are smaller, and serve both functions. I remember seeing a part number at the allpar.com sight. I would worry about vibration introducing leaks or failure in the plumbing above.

Make some 6" rods that just fit the bolt holes. Slide them in, use your hand to squeeze them slightly, wiggle the caps out.

Increase the base advance by 5 to 10 degrees and see what happens at idle. Most likely the idle mixture will need to be leaned, and the mechanical advance limited for high RPMs. After the timing change it might be possible to lower idle speed by 100 to 200 RPM.

Check your engine to firewall ground strap connections.