This class of vehicle has a unique characteristic post-groove. That is their tendency to set up a whistle at certain RPMs. Some find this terribly annoying, and it presents at different volume levels.
I have no solution, although I have tried!!! It has something to do with the flow through the air box as it enters the throttle and the angle at which it hits The Groove.
The PCV port will require a 5/8" cap. These are located in the far rear of the upper intake behind the throttle assembly. They can be difficult to remove, but are generally straightforward. The big thing is getting hold of them! I use a large screwdriver (I call her "Big Bertha") and simply lever it off, capping it with what is sold as a 'heater by-pass cap' and is commonly available in blister packs.
That ought to be enough to get you started!
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