We raced there from the early 80's till around 2006. My car was always .10 -.15 slower at Quaker vs 42 or Norwalk.
Also you did recall correctly NHRA did factor the Super Gas and Super Street index when they ran there.
We always felt the slight up hill grade after the 1/8th was the difference. But even back then the 60' times were slower as well. For me usually about .03 slower.
The track elevation does not appear to have been changes from when we ran there.