Love having the Rev limiter and not worrying
My 71 440 6bbl in my 70 V-code Roadrunner pulls HARD to 6k. I can't really explain why other than I and others "believe" that the purple stripe cam in it is the 292° .509" lift. 1 7/8" TTi headers, new CompCams lifters, springs, locks, and retainers.
Now once I get it on a nearby Mustang Chassis dyno, and run it, I will know the truth, but since I am about to get a LOT of fuel system parts changed out (Promax, Carter M6903) I am going to wait to go, because A/F ratio through the RPM range and through the gears is something I want to know.
Wideband O2 dual band (1 sensor per side) is a DEFINITE "soon to come" that has been added to "the list".
Anyway, the rev limiter on my ignition and the OP's are such a great safety and performance tool.
For me, ever since I had a rev limiter I now keep my gas pedal on the floor when I shift gears, I have a shift light too, set at 5,800 IIRC and the rev limiter is set at 6,200, which is where my motor seems to drop off-based on when I spin the tires in 1st gear, dozens of times, before the rev limiter, 6,1-6,200 seemed to be where it would level out all the while still spinning and pulling.
I cut 6/10th off a 13.9 in the quarter mile between power shifting, new wheels and drag radials, and switching from a Chrysler electronic ignition to a FBO electronic ignition system. I'm sure power shifting accounts for at least 2-3/10ths of that.