Hi ratrod . . .
Depends what you mean by 'newer' . . .
Chevy switched from the Huck system to Bendix in '51. Many consider this an upgrade. Others switched to this system years ago because the maintenance parts were easier to come by. I have the Huck system and intend to keep it for originality's sake.
At any rate, I think a set of '51 to '54 backing plates would get you started down this path. I don't know if the backing plates are the same on the cars and the trucks. And of course this assumes you are keeping the enclosed driveline.
If you are going to an open driveline then the options grow based on the vintage of the rear-end you choose. There have been several threads here discussing the pros and cons of disc brake upgrades for the rear.
regards,
stock49