@ 10:5:1 is was experiencing too much detonation running Sunoco 94 with 104+ booster.
The aftermarket stuff for Olds at the time was pretty much useless, the Holly Dominator needed port matching and the like. The Edelbrock heads at the time also needed machine work and porting to get them to flow.
I ended up throwing a DUI dist, MSD box, switched to VP fuels and never looked back at the time.
Not a fan of Sunoco 94 or ethanol, I think a lot of people think higher octane = more energy, while technically the opposite is true. Higher octane = slower burn = less power
I will also never run a dual plane manifold or hydraulic cam in anything performance oriented again, I just don't like low RPM engines. Just when things are getting fun you need to shift.
Cam specifications go a long way to preventing detonation with the crappy street fuel available today. I had 12:1 in one iteration of my 289 it was fine with 100 octane with a big overlap cam. Later I swapped in a milder cam to tame it down a bit for the street, the reduced overlap did not allow enough pressure to be bled off and it would ping like crazy. I even tried having 100 octane Av gas delivered by the drum to my house not realizing Av gas is good for planes and not so good for street cars. Combustion chamber style also makes a big difference.
I built a lot of engines over the years, most of them lacking in one way or another. I liked one 351Cleveland that was just a warmed over stock 1970-4V engine (factory 11:1) With just a few add-ons; headers, healthy solid cam, intake, and 750 Holley must have been making at least 450HP, with N50 Racemasters it worked well for an almost stock setup. I'm actually pretty happy with my latest Windsor style small block it makes >550HP and has really great street manners. A part of me would still like to build a strip only Cleveland. Those canted valve heads can make big N/A power, the serious guys are making 850HP-1000HP@8500 RPM
My buddy has a really quick 67 RT street car. We are lucky we didn't kill ourselves in that thing. It was gifted to him when he turned 16, with 13,000 miles on it. His dad and uncle purchased it new and immediately swapped in various engines, when they gave it to him they were worried it had too much power so they put a mild cam in it to slow it down. This was back in the street racing days. One late night we stopped at McDonalds to get a bite and we see this really cool 67? Dart with dual carb tunnel ram, slicks etc. in the parking lot. Next thing the guys with the Dart come over and challenge us to a street race for cash. We say okay. The suspension on the RT was tweaked and worked surprisingly well with the Mickey Thompsons as long as you launched it just right, if you did not get them warm before hand or launch just right they would just go up in smoke. I sat in the back passenger side to help a bit. When the light turned green I watched the dart lift the front wheels pretty good, but we lifted even higher and just drove past them. We beat a couple of blown Chevy's with that R/T. The R/T was quick but there was a faster street car in town Fletchers 69 Dart, originally with a blown 440 and later with a stroked and blown hemi, it was at the top of the pyramid. It was purple at the time. https://www.forabodiesonly.com/mopar/attachments/69-swinger-1978-jpg.1714710001/