Does the performer RPM come in different port sizes, cause if you have the one with 318 size ports, that'll limit your 360. I actually don't know if they come in different sizes, but that might make the decision between the two you've got for you
The regular Edelbrock Performer has smaller ports. The Performer RPM and Performer RPM Air-Gap are the same internally. The Air-Gap doesn't have a heat crossover, so it might be more tempermental on cold start-up and colder months. As mentioned by rumblefish360, a Stealth or Action Plus would be good, possibly more economical choices. LD4B or LD340 as well, but often pricey.
