I just did a search here on "degree kit" last night and came up with dozens of threads that discuss how to degree a cam. Checking mine is on my "to-do" list but I haven't gone through the process in many years, and don't have all the stuff to do it with any more.
Yes everything has to come off the front, and the intake, valley pan and at least one of the valve covers. And you have to have a degree wheel, dial indicator with some sort of base, and some other odds and ends. Suggest you do a search and read up on it.
In your case I would first go through all the other stuff mentioned and see where that gets you.
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1969 Lemans vert, matador red, 462 CI, 3.07 12-bolt posi
1974 455 TA, admiralty blue/red interior HPP "cover car" - sold
"The best way to show a car is to drive it"
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