I got a Holley regulator p/n 12-840 cause it matched up with my Mopar Performance valve covers and air cleaner.
If you don't want to spend that much, Summit has a quality regulator that I believe is made by Holley. P/N sum-3032. Both are adjustable 4.5 - 9#. I mounted mine on the inner fender well by the alternator and ran 3/8" steel line from the Carter fuel pump to the regulator. Try to use as much steel line as possible. I believe you will need a adapter as the output on the pump is 5/16"
Sorry, I don't know anything about Proform carbs, but they all follow the same principles :)
I just used the stock NGKs. Oreillys has them in stock or RockAuto. P/N 2635 GR4 gapped at .035 with the FBO ignition probably can gap at .040, but I used .035. I noticed a big difference with the NGK over the ACs that came with the engine.
I had to fabricate a throttle return spring as the intake has dual mounts for Magnum/LA but mine is an LA, which you shouldn't have that issue.