Nobody?
You sure got that word stuck in your head.
You'd also be wrong about the tire diameters as well. Try fitting taller than 24" tires on an early A body without sheet metal mods.
A bunch of people running 205/70-14's on Early A's (okay didn't look up a 60 valiant or anything) which are 25.4" tall. Looks pretty easy. Of course you can do what you want it doesn't really matter to me.
In any case, you will not find many people installing tires that small, and definitely not on a 67+A/B/E/F/M/J, likely see a tire 25"+ in which case its quite easy to upsize your wheels and have lots of options (really a lot in the 25.6-26.3" range)
Again, my recommendation of the stock brakes in that case and hydroboost stands if you want to stay with them. The hydroboost alone with increase the performance of any system, especially if you're not able to lock the front wheels easily (more pressure available). OP was clearly talking about brakes for 15" + wheels anyway
