Timing puzzle

Good on the concept of the cam moving fore and aft. In that same line, the distributor drive which is held down with a spring in the valve chamber if lifted due to helix gears or F to R cam movement would change timing. And I still like the least amount of rotational slop in the cam to dist drive gear and the intermediate dist. shaft. Most original cams are crying for an oversize gear.
 
How much rotational play do you have in the distributor cam when in the motor? Are you running a stock original cam, regrind, or a new cam? The gear on a stock or reground cam all have some wear on them and can let the distributor shaft float rotationaly which, will change the timing according to firing impulses. The only way to stop this to an extent is to use all NEW parts in the cam system, ie: cam, distributor drive, shaft and bushings. Any used parts will cause some movement in the timing. Like Wick said, throw that timing light back in the tool box for your modern car and time the A like Ford said and drive it.
 
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