If you are seeking the closest to OEM aftermarket solution on the market, Raybestos MC36307/NAPA36307 are equivalents. Internally the same, bore diameter, stroke etc. Casting looks a bit different and different casting number than OEM.
If you are doing an OE restoration, you'd want to hunt rebuilds for an OE Bendix, casting number ends in 1187. Or eBay etc hoping an NOS one pops up. Even though that MC was used for a number of years in the early to mid 70s for A,B and C bodies it's sort of rare to find one today.
I'm assuming you don't have an original R code car, in which case those disc brake hemi cars used a different unique master cylinder.
