So, I hit the 250k mark and had to rebuild the engine because I cracked a head and melted a piston. I finally had the funds to put it together and the first time I was getting low pressure, around 40 cold and 10 when warm. The rockers were also not getting oil. I took the engine apart again and realized the main bearings were too small. I replaced it a few years ago after I spun a bearing and forgot that the crank was probably machined. I replaced the standard bearings and put the .020's it called for. I put everything back together, primed it up, and was seeing oil on the rockers finally. However the pressure was still at 20 psi and there quite a bit of oil seeping around the distributor shaft and into the galley. I finished putting it together and it gets 20 cold and 40 when warm. The pressure does not fluctuate with rpm at all. Before it would get 60 on start and 40 when warm and reach 60 with higher rpm. I replaced the oil pressure sensor because I snapped the original one when I pulled the engine to swap the bearings so I don't think that is the problem. My gauge seams to work fine. Does this seam normal or should I be concerned? I know the older engines can run as low as 8 psi and be fine, but I don't know about the hydraulic lifters.