I don't understand why you want to know which valves are fully open. If you are trying to adjust them you want them fully closed. At firing position, exhaust 1-3-5 and intake 1-2-4 will be closed. At 180 out, exhaust 2-4-6 and intake 3-5-6 will be closed.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.