Yes... when adjusting valve lash per FSM, those two cylinders will be at 90 degrees on each peak cam lobe. The other 6 will be located at the base of circle. I'll post a photo tonight.
If I adjust valve lash for #1 and #8 cam lobes, per the FSM procedure the lobes for both cylinders are positioned the same, so I would be measuring with the feeler gauge on the beginning of the ramp on the flank of the lobe or at 90 degrees from the nose of the lobe. That area is where I believe the 261C seems to start it's duration, and of course on the exhaust lobe, where it would end its closing of the valve. Does that make sense?
Naturally, I could be totally full of Bravo Sierra!
I know, I know... I should just invest in a cam degree wheel and other tools necessary!!