z: Everything you say is true, GB.
The artical was from a 1991 Australian Street Machines Hot Sixes book, and it was prepared by writer Tim Britten with expert Australian input from Lynx's Graeme Nicholls, and Carburator Services Tim Howarth, guys with years of experience. In context, a 250 cross flow with a 350 (or 500) cfm Holley 2-bbl intake will out do the performance per price of a Blattman conversion to a precrossflow. Lynx sold 650 cfm 2-bbl Holley #6245 carbs for a while too; anything was possiable if you paid for it.
As Tim Howarth told in the article, "there is a bewildering array of carb kits....you can even put triple Weber carbs on your Marina 2.6 litre Six if you are stupid enough"
And back in 1963 to 1965,
everything six cylinder got triple carbs....you Austrailians were first to put a couple of extra cylinders on the B series, then, by just putting three SU carbs on your 1963 Blue Steak BMC Austin Freeway Six, you made 27% extra horspower, 97 rear wheel hp at 4500 rpm. A stock 85 hp gross 2.4 Blue Streak actually put 76 hp to the rear crossplies before any alterations.
So far only a couple of Austin Freeways have appeared in competition.
This one, leading two Holdens, is being driven by Charlie Smith.
IIRC, When written in 1991, for 16 years, 1960-1976, the Aussie Ford Falcon six was non crossflow, then, for 15 years (1976-1991), cross flow and detachable intake. Then OHC in some versions from late 1987 to date.
Remember, about 1.2 million non cross flows, then about 2 million odd Geelong built cross flow OHV and OHC's and DOHC Ford sixes exist, so in an Australian context, most 250's are cross flow with a detachable intake.