Okay, so I checked with a local machine shop (guy does mostly heavy equipment but does all things well), about a basic rebuild on my 65 383. He calls his parts supplier who proceeds to tell him that they only stock engine kits for 68 and up 383's. I can't recall any significant differences between the pre/post 68 383's especially on the short block side, am I forgetting something here? Why wouldn't a post 68 overhaul kit work on a pre 68??? (Not talking the 59 RB 383's here.)