Dez is a wiz at electronic fuel injection. If he told you he doesn't do carbs then it will be up to you to learn on his machine. Buy a jet kit and keep trying different things to get the drivability the way you want it and then bring it down there to tweak it. With your blow through setup I'm sure it'll be a little bit of a challenge but I'm sure if you persevere, you'll get it.
That's what my brother and I did with my new 347 that he built me this past winter. We kept working on the carb until we thought we had it perfect. The drivability was awesome! However, when we went down to Mike's shop to see what it would make for power, we noticed after the first run that it was running lean at WOT. It made 408 rwhp/379 rwt but was very lean at WOT. We pulled off the air cleaner, removed the carb, changed the secondary jets two sizes richer, bolted it back on and picked up 11 horsepower/3 ft./lbs. of torque. The air/fuel graph was right on the money from idle up until peak power. All in all, my car was on his machine for about 40 minutes. We made 4 pulls, performed one jet change, and had some fun. He only charged me $100.00.