What's all this nonsense about inches of boost? In my day on Hastings “boost” was measured in good 16 ounce pounds per sensible square inch and there were two types, plus or minus. Your namby-pamby inches of mercury were for arty-farty manifold air pressure.. Your namby-pamby inches of mercury were for arty-farty manifold air pressure.
It was pounds when I was on Hastings in 1957/8/9, in fact I was always under the impression that only American piston engines used inches.