MSD yay or nay

MSD I think, stands for
Multi-Strike-Discharge
Which it does to 3000rpm IIRC. After that it is just a
CDI, a Capacitor Discharge Ignition.
If you have a street engine with a big messy cam, yes it can help in the messy zone. But once the revs are up, any old ignition will work, the higher the amperage the better, and the CDI systems are often lacking in amperage, especially the E-cores.
You just can't beat a high-amperage coil on a capacitor, triggerred by whatever, but I personally like the no-maintenance magnetic hall-effect trigger.
The biggest cam I have run is the old Mopar 292/292/108. I cleaned up the carb, and never needed more than the Accell square-top big yellow SuperCoil, running at ~8.5 volts. I triggered it with the Factory Pick-up, amped up by the Orange box.
That cam didn't like 3.55s much, which is all I wanted to run; yes bad marriage, but I was young then, and so out it came..
Sometime after I switched cams, I decided I wanted a Dial-back timing module, and chose a Jacobs unit. Simultaneously, I installed a Jacobs Ignition CDI unit with a Jacobs E-core coil, which promptly left me stranded. Thankfully, the old ignition system was still under the hood, and before too long I was rolling again.
I shipped the Jacobs Amp back to them and they sent me a replacement ......... which is still in the shipping box that it came to me in. I had enough of Multi-striking.
Except for the above incident, that Accell has been under the hood since year 1999, and thru 3 cams, and three compression ratios always at between 177>192 psi CCP.
It's staying.
The system is still wired like factory, except on relays. During cranking it gets Full Battery voltage just like stock. In run, it goes thru the Accell-recommended ballast-resistor.
BTW
The Jacobs Dial back Module is still working flawlessly as are the Jacob's wires. They're staying too.
I installed the Jacob's E-core temporarily for testing, and it works fine. So if anyone wants the Two-pieces Jacob's Multi-strike CDI stuff,
Oh I forgot the point!
The point is that if my junk runs fine with the Accell coil and no Multi-Strike....... I suppose any streeter with a 292 or less cam, will also run fine when equipped the same.
BTW-2
If yur running an Orange box or similar Factory amp, then your car will run fine on any old factory amp substituted in, to get you home, just make sure the case is grounded. So then, you see a Volare/Aspen in the parking lot?...... No-No; just throw any known to be working, spare, in the trunk. Yes even one off a slanty. Throw a regulator in there too. and some new alternator brushes.