Haven't read into it but the guy at Fi Tech I talked to said their system is more tunable for big cam/high overlap/Low vacuum motors than the MSD Atomic (which I think is >/= 10" Vac and no tighter than 108 LDA with 240-ish @.050 lobes). I think those are general guidelines based on a 350-400" motor though. I know my buddy Nat's 442" AMC has a 236/244 @.050 .612" lift Hyd Roller on 109 centers and it idles great.

Both motors I have in mind for the Fi Tech have about 11-12" with carbs.

It's also interesting that Fi Tech wet tests all their units prior to shipping (it smelled like gas).