if all your tappet covers are off, it should be easy to see if #1 is TDC, compared to the position of #4. if its not, rotate the "special nut" 1 full turn clockwise stopping at "T" 1,4 to get #1 at TDC, and do the valve adjustments for 1 int & exh, 2 exh, 3 intake. then another full rotation clockwise back to T1,4 to get #4 at TDC, and do the others (2 int, 3 exh, 4 int & Exh).