Not Ranked
It's also a function of the time period in which most of the engines were produced and the technologies and techniques used to make them. Solid lifters for instance haven't been in a production car since when? 1970? I drove a Boss 302 as my daily driver until the early 90s and I have no idea how many times I've adjusted valves. So really the bottom line is either: be mechanically inclined, have your Cobra built with a new type drive-train or be well off enough to have someone else do the tinkering.
Good luck, Steve
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