Port my current M1 single plane or install the RPM Air Gap?

Sideways threads happen quickly with highly opinionated, inflexible thoughts because people are convinced and are staunch on there stance.

Your particular case is IMO ready for a single plane IMO. Though more information would be helpful. The current power numbers are a barometer.
More info -
Motor - 408 all forged internal balance - hyd roller 238/242 @.50 .580/.580, 10.5 to 1, complete MSD ignition, 35 total timing all in by 3000, 1 3/4" headers full dual exhaust to back. Adding 200 shot nitrous.

Car - 3250 weight, auto with 3500 stall, 3.91 rear gear - Street/Strip