1974 Duster
Need to tear down the engine in the next week or two- Either the fuel pump is failing or the Hughes fuel pump adapter is having issues. Some sort of metallic knocking noise can be heard when the car is warmed up at idle towards the right side. Really loud at the fuel pump when you use the stethoscope.
Will warm up the car then pull all the belts, run and check. At that point will then pull the fuel pump off and re-run to see if the noise goes away. Engine has been flawless for two years, I suspect the problem is in this area.
I have a new cam for the car with more moxy, so don't mind pulling everything apart, just bad timing. Might change over to electric pump at the same time, never really did like the adapter.