Summit 383 Top Performer kit

As far as actual “fitment” issues between the years.......

67 and earlier engines used different lifters and pushrods, so if a cam is included in the package, the lifters won’t be “correct” for both 67-earlier, and 68-later.

68-69 motor’s could have positive deck height pistons, which would require some sort of “work around” to run any closed chamber heads.

None of that is a big problem, you just need to know what you’re working with.