Curious I built a 470 stroker and was wondering what gap I should set the spark plugs at? I have i picked up autolite ra ibg plugs, the only thing I can find on the Mopar forums with these plugs is 0.045 gap, would this be a good go to use?

With a regular (non MSD) ign I'd start with the tried & true stock gap of .035". You can experiment with 40-45 and even 30 and 25 as Jacobs ign states that a smaller gap can provide a gain in some apps.

Right on. I should have mentioned that I'm running firecore wires and distributor, revvnator electronic ignition and a msd coil

I'm assuming the rev n nator ain't an MSD type (multispark) ign. I'd start at .035" and get an Echlin NAPA MO3000 rotor which has a .060" longer blade ($8 & change out the door) which will reduce the required voltage (needed if you play with larger plug gaps) as any external gap is a waste and it can help rotor phasing issues (if RP is off)