15/16" Master Cylinder for a 1967 Barracuda with HK front Disks

yes its for 73 up a body, i used all 1971 a body spindles rotors calipers and 73up, master said its 15/16 bore
Ok, you didn't say you upgraded. Makes a big difference. Anyway, did you have manual or power brakes? And did the Dorman # M80266 bolt right up to the firewall?