One other small mod I did a while back but forgot to journal was plugging the sound tube hole in the firewall. I bought a cheap PVC pipe plug from the local Home Depot (I *think* it was a 3/4" plug) for less than $2.
It definitely takes the edge off the harshness of the engine note in the 3500 rpm range and makes a small difference in overall volume, so I'd recommend it for sure!
I'm still kind of on the fence whether or not I'll stay NA with the car long-term, or go with the Edelbrock supercharger. If I stay NA, I'll most likely grab the Perrin intake tube to more cleanly replace the "sound generator" apparatus completely.
