Aussie heads are better than most Chevy heads of the era. The magazines love them, because the seem more like a Chevy head, so they understand them. Like anything, you can make them work fine. I think not worth the money. They are no cheaper to buy, cost more to ship from Oz. Valves, springs, seats, machining, cutting for adjustable rockers, studs and guide plates all cost the same.
So for the same money, do you want glorious 4V heads, with all their “problems” that you can rev all day long to 7000 rpm...or some Aussie heads that make your small Ford breathe like a Chevy?
If you found some cheap, and had good flat top pistons laying around, and were afraid of ever revving the engine above 6000 rpm, then they may be for you. They would give you a little more compression than American 2V heads. Your lady friends will not be impressed regardless of the path.
Just to reiterate, they will work fine, a friend had an Aussie headed “fake Boss” I used to race with. This engine was very strong. High rise airgap intake, titanium valves, lots of compression and cam. He ran a super light flywheel and mini clutch with the stacked disks. It was in a 2800 lb 68 fastback. It was a rocket ship. Engine probably cost him close to $20k. Cheaper than my race motor for sure.