School me again... first time tuning a BB

Hey guys. Thanks for all the input and sorry for being away from the thread for a bit. I ran a compression test and was in the mid to high 140s across the board. in regards to the stall, previous owner stated it was 3k, but on my drive its only stalling to about 2k. I'm not sure the process to definitively test that but Ill look it up. When I ran compression I noted most of my plugs are pretty dark. I put in fresh plugs when I first fired it and went one step hotter than stock based on recommendation. Research says I should have went one step cooler? I picked up vacuum gauge to try and dial in my idle a little bit more and see if that helps?

My plan at this point was to really dial in the idle based on vacuum, put fresh plugs one step cooler and see where I am at? I know I need a higher stall, but Ill have to hold off on that a month or two.
Another silly first time RB A-body question, for those of you with TTI or Schumachers, getting to some of the plugs is awful. Ive read that people shoot access holes though the in fender. Does anyone have a picture of theirs? Worth doing?