This information is from a poster on another forum that I have kept in my notes. One day, I will arrange all of this informatiom together to be useable hopefully.
"2) Cam walk. The early MEL's, as with their cousins the early FE's had a cam walk problem, especially when using roller lifters. The 58 through 60 blocks all had camshafts with the same size journals form the front to the back. The later MEL's, 61 through their eventual demise, had camshafts with journals of different sizes. The 1 journal being the largest and 2 slightly smaller follwed by the remaining three each a trifle smaller than the last one. The last journal was the smallest. This tapered camshaft, along with a newly designed fuel pump eccentric bolted the the front which was also tapered slightly to the rear and caused a back pressure on the cam, stopped all the cam walk. In addition, it made the cam much easier to install. If you have a 58 through 60 block and are using hydraulic or solid lifters you will not likely have much of an issue. However, we made a small spring and button that fit into the hole in the front of the cam spocket (you will have to machine a hole in the fuel pump eccentric to match). This applied a little pressure against the cam towards the rear. This stopped the cam walk altogether, even with roller lifters."
Also be advised the cam timing gear design was changed in 1961 (along with nose of cam) so timing sets are different.
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