I use the MSD 8252 (Blaster HVC) coil on the cuda and it's been great since 2006.
I have the ford coil (FD-478 or Auto Zone C-839) on the road runner.

I had misfiring issues w/ 2 brand new MSD Digital 6 Plus boxes years ago (2003-2004). Put my old analog 6AL back on and never looked back. I'm still leery of the digital boxes and not a fan of anything that needs a computer to tune it, even though they have some awesome features I could really use.