…because the dual master cylinder, if you select the correct one, has a snap ring for the piston stop. No external bolt-on plate needed. The master cylinder you want is linked
here, along with other suggestions for a successful drum-disc swap. Also see
here.
You'll need a distribution (splitter) block; this can be had used from any A-body with 4-wheel drums, '67-up, but those aren't exactly common in the yards any more, so probably easiest to get it new from
Inline Tube. You'll need to run dual hardlines from the new master to the splitter block. Be sure to bend two fully-circular loops in each of them to let them flex. Steel line is standard and is a pain to work with;
Cunifer is a lot easier (and better).[/B]
