MSD!!!
If you have a standard, I would suggest the 6AL because it has a rev limiter built into it (that's what I have). If you have an auto, I would suggest the 6A. It's the same thing just without the rev limiter. You can also get different retards for your car. The one that I have mounts in the engine and I can adjust it with a little screwdriver and activate it with the flip of a switch in four different stages
They make one where you can adjust it with a knob. The reason why I recoment MSD is because they are high quality parts, they won't let you down, and they are just a plug away. My Autometer tach just pluged in and I was done....