which mastercylinder and brakebooster

iI need a new mastercylinder and brakebooster for my 66 Barracuda. It is a original powerbrake disc/drum car. The original was working fine but leaked unrepaiable(well in this time i was thinking it is unrepairable) so i bought a mp brakes setup. Was not so happy with it ,but at least dual circle now i looking for something new. Any reccommendation for me ?