"Let’s take a look at the history behind one of the most iconic “It’s not a racing engine, I promise!” engines GM ever produced: the L88!" https://www.corvetteforum.com/articles/the-l88-427-a-history-of-gms-ultimate-big-block/
Years ago at the Portland Swap Meet a fellow had a NOS side oiler block, was asking 5k firm. Bet that would be 10k now.
"Yes, it’s a hemi. No, it’s not a Chrysler. It’s a big-block 427 CID Ford hemi engineered by Mickey Thompson in 1963. But wait until you see inside—you might not believe your eyes." "Fairly interesting engine so far…intriguing and creative, but nothing too outlandish, right? Now check this out: articulated three-piece pushrods. To make room for larger, straighter, greater-flowing intake passages, M/T took a radical step and split the pushrods into three segments that snaked around the ports." Full article Here: https://www.macsmotorcitygarage.com/mickey-thompsons-427-ford-hemi-v8-and-its-fascinating-secret/