these are about the best aftermarket non-bling-y brackets that kinda sorta keep everything in the stock location.
https://www.bouchillonperformance.com/products-aircon-compressor-brackets
should clear errybody without too much fuss.
i loves me some performer on 318's and mild 360's. it's great intake for what it is, but it's terribly suited to high RPM operation (in stock form), but it's a great piece if you were building something stock ++ or like a touring car.
the issue is with your set up you've got mismatches on top of mismatches and trying to accomplish something that wasn't particularly in mind at the initial build level. you've got great bones with the stroker long block and AFR heads, but then it just all kinda falls apart from there. that set up screams big power-- .500+ 280+ cam, air gap and a big old honkin' double pumper. but then you're in a truck, with big tires, freeway flyer gears and no stall.
none of that is conducive to that set up. but you already figured that out.
there's some super solid advice upthread here and that's sort of the direction i would take. i like that howards cam and if i was buying off the shelf, that would probably be my pick. but i'd contact ken over at oregon and get his thoughts on the matter, he may have something a little more tailored to what your specific needs are. so, resist the urge to go whole hog solid roller with 300 duration and keep it more reasonable in that department. then nab an airgap (or one of the weiand wonder twins), and something in the 750~800 range with vac 2ndaries that's
also got down leg or annular boosters and it should round out into a very nice package for your particualr application.