Bewy suggested it due to the rpm range the intake was designed for along side the camshafts general rpm range. I myself would choose ether intake based on what speeds I’m driving at 90% of the time.
FWIW, in my ‘79 Magnum, sporting the 5.9, the choices at the time were the chink intake or the RPM. There is no performer intake for it but the M1 would be its equal for discussion sake. It was not available new at the time. The RPM got the job. No camshaft added.
There’s no real issue with its rated lower power band. A 1500 starting point. But there is a difference. IMO, it’s easy enough to ignore and getting the carb to act right on top.