We recently purchased our 2nd motor home,an upgrade from our 85 Pace Arrow. its a 96 Fleetwood Bounder 36S of a Ford F53 with a 460. its in great shape, runs & dries good, my biggest complaint is lack...
You make some very good points. As you say, combustion chamber shapes are changing. H&H Flatheads now make Navarro heads with a 61cc volume for use with their S.Co.T superchargers (not a turbo).
Plenty of street rods out there with one and sometimes two turbos. I'm quite sure they run hefty radiators along with a shroud.