Purple Cam Design Question

Purple cams are actually pretty aggressive,thats when advertised vs. .050 still played a big role in determining a cams aggressiveness and as the specs show mopars have more duration at .050 vs. advertised than others of that time.One of the reasons for lower lifts across the board had alot to do with the technology (heads being a big part) of the era,most people were running nearly stock type heads and the main mods were to compression,intake and exhaust so lifts above the mid to high .400s were not necesarry for the majority of engine builds,compression and gears palyed the biggest role in performance.Modern cams are designed to take advantage of lower compression,higher flowing heads ect.,spread the power band out and make more vaccum to keep a vehicle streetable and they work,these things were not such big concerns back in the day.