FWIW...there's a 20 year old MSD Blaster 2 coil on my dad's road runner and it's mounted sideways. Been on his car since 2008 and it was on my car from 1998-2006.
Guess it may be like everything else...the quality nowadays isn't what it used to be.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax