I guess if you put the heaviest spring in the secondaries, they may never open or maybe just a tiny bit. but, otherwise, I like it! who did the intake?
Those are Quick Fuel carburetors. They have infinitely adjustable secondary diaphragms. I have a Quick fuel 450 on my slant and it dumps the secondaries open so easy it's pathetic. No bog. It just starts hauling ***. It's all in how you tune one.