Shake rattle and roll

Still at it. Swapped the coil and ignition module to humor myself. Last time I tested the fuel pressure it was 7-8 psi and steady. Today i got a banjo fitting with pressure gauge outlet a holley pressure regulator (4.5-9 psi) with all the fittings to match. I was getting an extremely sporadic reading from 3-4 psi that dropped to almost 0 at throttle. Bypassed the new regulator and got the same readings. Bypassed the filter and got a very steady 4 psi. So assuming it was either dumping fuel out the return outlet or clogged I bought a new filter now im getting a better reading of 4, but it bounces a bit and has random drops. Tomorrow I am going to pull the pump and use a screwdriver to check if the hughes cam extender kit has come loose on the eccentric. If not I will replace the pump with my old one. I may not be fixing my surging issue but it seems I will be fixing every other issue along the way.