Another great issue! But let me raise a relatively minor, but often mistaken, point. The engines of the PB4Y-2, and all US combat engines, were supercharged (mechanically driven), but not all were turbocharged, as was the B-24, and others. All turbos (exhaust driven) blew into superchargers, usually via intercoolers.
Keep ’em comin’!
Well…it’s obvious we don’t know everything. Good Info! BD