This series was published in 1973 and 74. I picked these up mainly for the Smith covers, but I was buying a lot of weird series books back then. I think there were at least seven titles, with covers by other guys.
I never got around to reading one, but the back of #1 says this:
HERE'S THE DYNAMITE FUNG-FU ACTION STORIES YOU'VE BEEN WAITING FOR! The greatest Kung-Fu experts of all time in a thousand bloody battles to the death! From the wastes of the Gobi desert to the sin alleys of Hong Kong and Shanghai, the young fighter K'ing hunts the mad killer of his master - the infamous Kak Nan Tang - on a vengeance trail ripping with action. First in a series of adventures - watch for them each month!
I have no clue who Marshall Macao was or is. Anyone else know?
More Forgotten Books (including discussions of what's inside them) at pattinase!