I scope tested a bunch of coils at one point and it takes a LOT 
of coil to out perform the Jeep stock air cooled coil.
Ran all of them off a MSD 6AL they all came out within 
about 8KV of each other.
What we did notice was the MSD air cooled coil would produce 
more current than most at high RPM (10'000)
And AIr cooled coils in general pulled less current 
on the low voltage side than the oil cooled.
Dave