all the factory street hemi stuff i played with decades ago had a loose wide groove tri-metal main bearing set ms2896p and a cb665p rod bearing that was .001" looser than the cb527p bearing. in stock condition 10-15psi at hot idle wasn't abnormal. some folks would freak out about it and install wedge bearings that were .001" tighter on rods and mains. of course being a survivor with unknown use there could be some wear on the bottom end. also they used a standard rotor pump with a black relief spring.