Possible MSD 6AL failure

Crap, I may have a more basic problem.

My MSD ignition consists of

- 6AL Model 6420. Older analog one before the current 6425
- MSD distributor cap. Not sure of model number, didn't want to pull it.
- Blaster 2 coil. MOUNTED HORIZONTALLY.

I remember reading some threads that this coil is oil cooled and needs to be mounted horizontally. Looks like I'm off to buy a Blaster SS since my mounting locations are limited. Any one have experience w/ an Blaster SS? I'm hoping it's just a drop in replacement. I'm going to check the MSD forums but it takes FOREVER for their admin to approve me.

I'm still checking the resistances on everything just the same as a sanity check.