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Exh leaks do not knock, they tick. Could be the rod brg, cracked piston. A problem with the piston pin is usually a double tap noise. Either way, I would strip it because it ain't gonna fix itself...& much worse damage could ensue if left...
I suspect a small gap between the p'rod pump arm is causing the noise.
Carter/Edel carbs will quite easily tolerate 10psi of fuel pressure, but the float level must be reset....because fuel pressure changes the fuel level.
The 426 Max Wedge fuel pump was rated at 6-8 psi & the Carter AFB carbs...
Pert has a HEI style module that provides multiple sparks to 7000 rpm. No other company has this. Those who believe in Pertronix should ask them: is it an inductive system, CD system...or something 'else' ...
Why not leave the eccentric in place? It causes no harm & provides the correct dimension for the retaining bolt. If the car is sold, the new owner can use a mech pump if desired.
Are there aftermarket upper control arms available for Mopars that give more castor? That is what is needed. A P/S box that is working properly moves the wheels after INPUT from the driver [ steering wheel ]. It will stay in that position until it gets another input from the driver. The only way...
You do not need a return line, if you have the right pump......because when they shut off, the fuel drains back to the tank. There is no pressure build up like mech pumps have.
A Carter #4594 elec pump will solve your problem, on it's own, NOT with a mech pump in series.