Besides, the problem with timing is not determining the distance BTDC of the the piston, that's easy. If you want that translated to angle, that info is somewhere here in the forum, thanks to Richard (Orabanda), as I recall. The problems (unless you have slotted the mag base) are having to remove the timing cover and, then, tightening down on the mag taper without losing position. After gawd knows how many attempts, I ultimately got to a comfort zone in tightening down the taper, but removing the timing cover is, for me, a reality to live with.
Richard L.