318 oil pressure

Were the new pushrods the EXACT same length as the old ones? I gotta wonder if the plungers in the lifters are not a a different position and that is somehow causing extra oil flow through the lifters.

Or as suggested.. crap in the pickup just coincidentally happened to show up at the same time.

BTW, is your Mopar a blue 67 Coronet?
Yes, they are the exact same length. Just these have solid ball tips at the end with no oiling hole, while the originals had a half circle kind of point, with the oiling hole. And nope, no Coronet here