Not sure who's carb you were using, but that is not true across the board. The fuel curve under boost is easily controlled with the latest boost reference power valves. Acts 100% like a normal carb, until it sees boost and then goes as fat as you want it to. Piece of cake... The ONLY time I've ever had carb issues is when I'm getting outside the power window of what it was set up for. When I tell the guy it's only going to make 700hp, and I'm trying to push it to 900hp... yeah it needs a bunch of jet!
The timing thing is no big deal either. Lots of boost reference options out there that will control timing. Lets you run full timing at no/low boost, and pulls out as needed.
Of course, there are exceptions. Love your car by the way. I am just saying, it can be more difficult than it first appears... Its been nearly a decade since I played with centrifugals, and if I run a centrifugal again, or a turbo, it will be with fuel injection.
