I jsut recently bought a MSD Ignition Blaster coil, and a MSD distributer cap with external for blaster coil. I also bought a MSD ignition control box. The one I bought was the MSD 5. Here is the link http://www.truckstuffusa.com/msd5igbymsdi.html
. Will it work for a 4 cyl, will it help my car?

 

I have everything you just mentioned but I have a 6Al box. And the external coil did more for the car then the box. But it never hurts, helps at high rpms.

 

What is the difference between the the 6Al you have and the MSD 5 I have?

 

I have no idea mine has adj rev limilter. through those little pills or chips.

 

The MSD 6-series is an analogue captive-discharge ignition. That's what you wanted. The 6AL is the basic 6A box plus a "soft" random cylinder ignition cut rev limiter.

The MSD 5 is a simple analogue multi-spark system. Nothing really special.

If it was up to me, I'd have gotten a Crane Hi-6 or a Jacob's FC1000. Both of those are digital captive-discharge units.

 

come on I got mine in '98 there was limited options then, probably if I had to do it again I would get something different but it works.

 

there's also the mallory hyfire 6a and 6al (both are digital and the 6al doesn't require pills)