priobe Phil The reason you have low idle
oil pressure is the crankshaft. If it is the nascar steel shaft, IT"S CROSSED DRILLED. It uses twice the normal
oil and cuts the pressure twice as fast. Sorry for being brain dead. The other thing is that you may want to run a HV
oil pump and use your spring kit for 80 psi. I found the blueprinting for this motor. .002" on the mains and .0025" on the rods. this is with your rods. This also includes the correct rod bearings that are .080" wider. This is from a 1967 manual on this motor. Caution note was not to let motor idle for any period of time. What ever that means. I would have to look for specs on the GPM for each oil pump but off the top of my head there is a 30% supply differents between the too. Maybe a HV pump is a better deal with more supply to offer. It may also give you another 5-10psi at idle. This may help extend the motor life.
Sorry for the brain fart.
Rick L.