I would think unless you are racing, you shouldn't be over revving your 440. There were a couple tachs that had built in limiters, which essentially just just down your coil, which I don't ever think is a good idea, since you never stop dumping fuel.
I like MSD soft touch limiters, it cuts ignition in patterns as to not load any 1 cylinder. The issue with this is it wont be a hidden install, there distributors out there that don't have separate boxes but will need to scrap your existing dist....
I would just go all the way msd pro billet with a digital 6al, you will pick up a noticeable amount of power and economy plus get the limiter you want. Figure around $500 and you are done. I would also do a coil and nice wires, you will most likely have to readjust your carb since you will now be burning all that fuel.
We did a 340 cuda a couple weeks ago, got rid of the stock ignition, added a pro billet, 6al, wires, coil, new plugs, and went up on the jets. It made a real difference, better throttle response, not as much fuel smell in the exhaust (not sure what cam that motor had but it seems to dump fuel in the exhaust pretty good, we are going to change the cam in the winter, he says its WAY too lumpy anyway)...
ANYWAY hope this helps, pertronics drl will work with about any system, points, hei, old msd and mallory, (non cd) etc etc and doesnt use pills, it has little rotary dials, and I would imagine can be hidden well... ALso check out msd 8728, I think I have a used one around here somewhere, I can look if you are interested..