I ran a Sprint Mag for 4 years and a Sprint Mag II for 10 years and NEVER had the magnets charged in either one.
I have been told the same thing many times by others.
If your running N/A on Gas / Alky anything above a Sprint Mag II is overkill and there will be nothing to gain.
Talk to Spud
http://www.fuelinjectionenterprises.com/
or Ziggy ( Don Zig )
http://www.donzig.com/ ... either will give you the facts
Evidently Zig isnt taking any new work in ... and hasnt been for most of this year that I know of.
Good Luck either way you go !!