Mopar DID make a 350. But it was a tall block big block, and made about 30 years before his truck. There was also a tall 383 back then as well.
The "3/4" race cam got it's orgins i the 50's as well. Back then, there was pretty much two cams to choose from. A "stock" cam, or a "race" cam. Well somewhere along the way one of the manufacturers came up with a "tweener".
