Originally posted by DynoDon
Some times big problems can be caused by easily overlooked basics. Is the MSD a new add on? if so, make sure it is grounded directly to the block & the power lead connected directly to the starter or + battery terminal. BTW, do you have a rev limiter?

That's a very good point.

My MSD 6AL came with the 3000 rpm chip installed.
There were a couple of extra chips with it.
6000 and 7000 rpm I think.

Different rpm chips area available at Summit and similar.