Yes, the X-flow housing is exactly the same as the large diameter out let top unit found on all 1971 200/250 tall deck engines. There was a minor case change with the XA in 1972, and it became 72 DA 8594 AB. The 1963 to 1983 200/3.3 US engine carried C8 DE 8594, the same part but with a smaller snout. They clocked the whole thing so its flat to lower the radiator hose with those tall deck engines, which were 9.38" rather than 7.803-7.808". And there is a petcock in the top bolt to let entrained air out after refilling the cooling system from October 1980 when the first Alloy Head came out.
I use one of these housing in my Mustang, fits fairly well, but the emissions gear hits one side of it, not major concerns.
The interchage between it and the stock US stuff is good enough to get you out of a bind.
As an example, last night, I blew my standard 1981 Mustang hose while I was out calibrating my Brantz meter about 12 miles out of Dunedin.
Had to grab a 2T Toyota 1770 cc OHV top hose, a short section of knurled trolley jack tube, and the good section of the old 1981 Mustang hose to the radiator.
This morning, I got the stock short non A/C 1976-1990 x-flow hose, GATES 05-0273 and the 1982-1992 A/C option version, GATES 05-0470. The a/c one fits the Mustang with a few dodgey kinks, and is better than running a Tojo part on my Ford.
I've got the hose you need, its the stock 1976 to 1990 non air conditioned 3.3/4.1 x-flow. This is the factory short , its is what you need for your Fairlane. It's listed as "Falcon Fairlane Cortina 6 cyl 1976-on". Give me an address to post it to you. It was really expensive...about 9.95 in US dollars
The short x-flow hose GATES 05-0273 Falcon Fairlane Cortina 6 cyl 1976-on
The short x-flow hose verses the stock 1978-1983 Fox car A/C 3.3 item, similar, but not interchangeble to length.
The larger Aussie 72 DA 8594 AB Log 200 & 250, 2V 250 and 76-90 X-flow 3.3/4.1 unit in my 81 3.3 Mustang. It hits the emissions junction bracket, but is okay asside.
Comparison between both the Aussie 250/4.1 item and the US 3.3 item, 72 DA verses C8.
No difference asside form external diameter. Same thermostat, gasket, bolt spacing.
A trio of hoses after last nights (my time) quick repair. At the top, the old Toyota 2T Corona hose and mustang part showing the A/C 3.3 US Fox car profile. Put together under urgency at mid night. The next is the long x-flow A/C 3.3/4.1 hose, the right size for my Mustang, but a bit kinked out. Bottom is the short x-low non A/c hose, which didn't fit, wasn't long enough.
The A/C x-flow 1982-on Falcon hose fit is okay enough for my A/C Stang