Changing from 8.25 to 8.75

Ok so I have this complete A Body 8 3/4 drum to drum SBP. What would be the best way to put this rear end into the 74. The car currently has a 8 1/4 BBP. Can't find a A Body 8 1/4 with a sure grip.

Get a set of Big Bolt custom A body axles and use your 8 1/4 brakes as 72bluNblu said.