curious about valve lash setting/check

Absolutely you should be sure! It's that important.
****, my apologies to all! I thought the shafts were opposites, not the same. that's why they have to be in rear on the passenger side and in the front on the driver's side? :) same shaft set-up with the oil holes, just reversed on each side to accommodate the oil holes? well, I may have problems then, because the notches are both in the back.