One fix at a time
I don’t see any issues. 15 minute swap back to the factory MAF especially since you are reusing the stock bubble. Just unbolt the CF merge, filter, box, and bolt in the stock MAF. If you don’t have a filter don’t worry about it since you may not be going out to drive it. You’re just running it in the garage but need to determine why it is so rich with correct injector corrections. Swap stock injectors back in. Leave the GM MAF in place just disconnect from the MAF plug. Super simple to go back to stock known good injectors, MAF, and no extra fuel control. See how it runs after that. I guarantee it will save you hours and hours of work. Also, plug that hose nipple on the front pre-turbo pipe that used to be there for the charcoal canister.