Dual Master cylinder For 1966 Buick Special

Johnnys 66

Need to replace my master cylinder so thought it would be a good time to upgrade from the single stage master cylinder.
Other than the lines is the 67 a direct bolt on?
I have manual drum brakes.
Dual master, distribution block, lines and you will probably have to change the activation rod from the pedal that engages the master. The dual cylinder rod goes in a little deeper than the single.

eta: try and source everything from a 67 donor. This would be a perfect time to upgrade to power brakes.