Had the same problem with a 440 years ago. Guy said he was going down the freeway when it lost oil pressure. Said it's got a top end noise. Four L shaped pushrods laying on the head, but it also dropped # 5 and 7 rod caps, and buried them into the side of the block. Bent the bottoms of those 2 rods upside down, carved a quarter inch divot in the crank journals. All because he left a shop rag in it when he changed the timing set, and it sucked it into the pickup. You're lucky!