I think Islander2 is right. I have the old P&W radial engine manual, purchased from John Deakin.
Just a couple of things:
One could run a carb engine LOP but would need a means of balancing up the air and fuel delivery to individual cylinders. This is done in competition engines (1 carb per cylinder, perhaps, or the old radials?) but if you have just one carb, you are stuffed.
GAMI injectors are standard Lyco injectors which have been measured up (or drilled out) by GAMI for a specific flow rate, and they sell you a set of them, selected to match up your (uneven) air delivery figures, such that all cylinders reach peak EGT at the same common fuel flow figure. This enables smoother running, but not everybody needs it to be able to run LOP. Some people are lucky. But that's a fuel injected engine. I've never heard of anybody being able to run a single-carb aircraft engine LOP - it shakes too much.