Mopar 284/528 mechanical camshaft

The 318 Engine Build - A Parts Book 400HP 318 used this cam: "We selected a Competition Cams 280H Magnum camshaft, which is a single-pattern grind featuring 280 degrees of rated duration and 230 degrees of duration at .050-inch tappet rise. This cam is advertised as having .480-inch lift, but with the higher-ratio Magnum valvetrain, theoretical lift goes up to .512-inch." Not that far off from that solid Purpleshaft.