I'm workin on a mostly stock '77 280, except msd 43 gph f.pump(noisy bastard). feels electrical. primary coil resistance is .3ohms, secondary is 10.75k, resistor block is 2ohms wires range from 7.99k to 10.20k, plugs are new, cap & rotor look good, pick up set at .3mm. I tried downloading the manual from this site because I don't know the actual acceptable spec range(s). fuel pressure is 30psi with regulator under full vacuum and 43psi with no vac. I installed an inline filter before the pump and a new factory filter under hood. I even tried bypassing the fuel damper, that just made the pump noise louder. I insulated the pump in the factory bracket by wrapping in rubber to make up diameter, reamed out the mount plate holes under the mount bracket and the mount plate and insulated with 1/8" rubber and o-rings around bolt to prevent metal to metal contact. Still annoyingly loud, any ideas on either? obviously the performance issue is more important. Who wants to be my new buddy??
Derik