Too much intake? RPM Air Gap on a stocker 360
It will give up a little torque down low compared to a regular non RPM Performer.
I've swapped a lot of intakes back and forth on many engines and a RPM will be a touch lazier than a plain boring Performer until you hit 3000 rpms.
I am sure it will run fine, but if he wants low RPM torque I would use a different aluminum intake, or an iron 1969 340 intake.
Tom