Lifter problems????

"Are the rocker shafts on properly? are you getting plenty of oil up top?"

He's asking if your getting oil through your rocker shafts, not do you have sufficient oil pressure. Two different issues. The pics of the pushrods are very blue, meaning they were getting very hot (lack of oil?). I personally would remove the distributor, and run the oil pump with a drill and priming tool. Rotate the engine and do the same procedure. The LA blocks "alternate" the oil feed tot he heads based on the rotation of the cam, so you will have to rotate the engine to check both heads. I think you might have lack of oil to the heads, which caused the pushrods to fail. My .02 worth.