I will be checking my cams lift this weekend, I'm not a complete noob to this, I went to college for automotive technology, and worked at a dealership for 3 years, that was 9 years ago. now I'm a linemen working on the road, bought the modis is 2018 when I flagged down a random snapon dealer to warranty my ratchet. Honestly only used the scope, maybe one time for a wheel speed sensor, if I'm able to save and upload the graphs, I have no idea how that's done, will do some googling and maybe be able to get good data logs for you guys.
Btw I've ruled out misfire with my "cylinder deactivation load test"
I've sprayed carb cleaner all over to try and find a intake leak, found none
The data is shown 15 degrees advance at 44 mph yes
I've pulled plugs 3 weeks ago and they all looked the same, a bit black, they got cleaned and gapped b4 they went back in
I'd like to add, the more and more I think of this, I've feel like I've covered everything, except mechanical, the cam makes logical sense in my mind, and not a thing I've done or the previous owner has done has made a bit of difference. Maybe if I was older and had more experience with the sbc, diagnosing mechanical issues would be easier. I do appreciate everyone's input, and I thank you for the ideas, except the ls swop idea, that's not going to happen, lol