Though not purchased to get the rev limiter per se, one (1) of the functions of the MSD 6AL-2
digital controller is that it has that function built in.
Specification of my 29D engine pretty much mirrors that of Andrea's; balanced, Isky cam/valve springs, SuperPro damper, lightened flywheel, temperature-regulated oil cooler, Mallory distributor (single point trigger), MSD and a trio of 45 DCOEs.
The engine seems willing to wind itself higher, but the rev limiter is set at about 5900/6000 (set and forget...). Since the limit on this model ignition controller is set with dip-switches, I started out low (4500 or so), to test its capability, and then walked it up in 100 RPM increments. A very satisfactory controller (and if it ever craps out, relocating a couple of *key* wires, and I can drive it home) and absolutely cured the issue of loading up the plugs in stop & go traffic__the only running scenario I didn't seem to be able to
tune out of the Webers (specially ordered with 36mm primary chokes, versus the standard 38mm variety).
Though I did install a fresh set of plugs last October (prior to an All British show up near Tampa, I probably haven't actually "tuned" the car in about five (<5) years (the full, valves to carbs tune-up). I did increase the idle-mixture
volume after moving to Florida, apparently that was enough of a difference in altitude, but cracking six (6) screws CCW 1-8th to 1/16th of a turn hardly qualifies as much of an effort...
The damper can be installed with the engine in situ, but it does need to be raised up a few inches, and well worth the effort to gain more room by removing the radiator. There are many posts here in the forum (several by me) about the damper installation, and I recommend that you read all of them before an attempt is made. You don't want to face a damper stuck half-on as it cools down!