Please, take "steps" to reduce your compression. If not, it will be a steady "diet" of mixing race gas and pump gas to avoid detonation. THERE IS NO FREE LUNCH! If your static compression is above 10:1, it WILL detonate on 93.
The approach we take here (CVMS) is to reduce the compression to a manageable point (9.5:1 max with iron heads) and use a camshaft designed for the purpose of making power with lower compression. The only cams we've found to do that in a consistent and superior manner are the Comp XE series. But don't use one UNLESS you reduce compression! It will compound any detonation issues.
As for the carb, the 7040240 is a 1970 Buick. It is not 800 CFM. They (800s) first appeared for the '73 455SD. It's rated at 730 CFM. That being said, it's still a good carb. It has been rumored the '71 455HO carb was the first "800", but according to Cliff Ruggles, it PERFORMS like the 800s up to the flow limit. Something to do with the boosters is different than any other Q-Jet.
Jim