I've always liked giving an alternative point of view, based on nothing other than past personal experience.
Overall ,brakes are a bit like oil.
The more you pay, the better you get?
Ok, so when's the first time I played with brakes.
What would a car builder know about brakes when car enthusiasts are so much smarter?
Going back to my Z in , let's say 1979.
Transplant a 272, still the Z box but adaptor and a spacer in the driveshaft.
Higher gearing would be better?
Top is always 1 to 1 only the Austin Maxi has a 5 speed but what about overdrive? Laycock? Triumph, Rover , Jaguar?, well I did that, the jag but for some reason I also did the Falcon LSD, well or course 'cos spinning one rear wheel doesn't work so any LSD is better but 3.23 gives lower revs than 3.545 and fuel economy counts.
The big problem with a Falcon diff is that apart from being wider and needing to cut out the inner guards, the drums are bigger diameter and wider and when you stomp on the brakes,power assisted all round and discs on the front, the back end locks up. Then you're in deep sh** 'cos you're out of control and have to lift the foot. It's not a good feeling when you're going too fast and not expecting it.
No doubt it's a downgrade which necessitates another forced upgrade, being a remote booster, boosting just the front. Well actually I already had the remote booster but boosting front and rear, that was because of the V8 the original wouldn't fit. All I had to do was re plumb it. Of course the firewall fractured where the master cylinder was mounted to, all due to the extra foot loading required.
That's one reason why my brakes are always OK and doing any mod to them is more likely to take me backwards rather than forwards.
The way the rules are these days, to get an old car back on the road again, you've got to have dual circuit brakes, a friend went through it recently, his had a 289 in it and had to fit a booster and dual circuit master cylinder, again I think from a 'coon. Easy with a 289 being a low deck block, not easy with a 272 nor a 351C
Prior planning prevents piss poor performance.