The Cam is not exactly a "broomstick", bigger than a 440 Magnum cam,

The Performer intake is a doorstop (small cross section designed for smog motors) and IMO it's no better than an Iron Magnum,,,,

I would 100% try going to a street single plane (like a 440 Street Dominator) which will both lower your idle vacuum a tad and...if you fatten up the jetting (i suspect you are lean) that will definitely help with drivability.

What is the distributor curve? Vacuum advance?. Big opportunities there.

Either get an adjustable canister and dial most of it out (too agressive off idle) or get FBO to build you one.

The Heads should help reduce ping all else being equal. if that is a 110 cam where is it in at? go in straight up (110) or even 2 retarded and that will kill a little cylinder pressure right there.

Running a big oil cooler and transmission will lower internal cylinder head temps as well. The radiator won't have to work nearly as hard and oil does ~1/2 your cooling anyway.