Oblong bearing---keep in mind that many bearings have been made that are oblong to an degree, counting on the rod stretch to lengthen the hole to create a more perfect circle.
Are you absolutely possitive that the
oil galleies in your block are open to
oil flow?? I have seen many hiper and police interceptor blocks where the gallies were drilled(most not) but were blocked off in the feed holes at the #4 cam area feed from the center galley out to the lifter galley
If that block was in an engine with adjustable rockers, it is probably blocked off------
besides using the pushrods to supply
oil upstairs do you also feed the rocker shafts from the 2 and 4 cam bearing??