I am the one who had the carb we reversed engineered to come up with the “hangar 18 mod” hangar 18 is my buddy. We took my 750 apart and modified his carb exactly the same. I got that carb from Ak Miller and ran a small block blow through set up in the mid 90’s. The PV orifice needs to be opened up and the anti blow back check ball needs to be removed oht of the signal circuit. The carb hat causes lean cylinders even though the O2 sensor says its ok or rich. You need to be at least 10 sizes bigger on the side where the hat points. Also a single plane intake really help with distribution. This is a cool build, i love it when someone has the guts to take on a project like this and is willing to learn. I cant wait to see what it runs at the track. I had a similar set up back in the 90’s. It ran 10.0s at 133 with 2.76 gear off the foot brake with a mostly stock 360.