Wow, thanks for all the replies
I just have a regular Accel distributor, high RPM module with a an Accel coil etc. With the high RPM module, motor runs good at 6500 rpm, I haven't ran it any higher.
I will take a look at the 3 step MSD, we run in a foot brake class, but I want something to protect our engine in case something like the trans breaks. We built a fairly strong engine and I would like to keep it together for a while!