power valve makes my 440 ping??

I don't think Holley recommends mounting their regulators on the engine, so vibration might be an issue (although I doubt it), ask Holley.

You also have an obscene amount of rubber fuel line, which can break down inside and send bits of crap throughout your fuel system.

Not sure what coil that is, but it looks like the factory ballast resistor on the firewall. Are they compatible?

I've spent enough time working on British cars to know that the main problem with SU/Stromberg carbs is the Lucas distributor. A re-think of your entire ignition system is in order, and perhaps before you spend too much more time on the carb.