7 1/4 rearend brakes swappable on to 8 3/4 ?

Yea I get your logic, The most my Valiant will have will be 300 hp. The only reason Im swapping it is to have more access to a gear ratio of my liking. But i do believe that the 7 1\4 is more than enough for that much power. I just found a set of A body axles and drum brakes for 150 so Im going go with that