You don't need a Hyperspark distributor for timing control if you already have a MSD distributor. You can lock out the advance mechanism on the MSD and use a adjustable rotor to phase it properly. Also need to pay attention to good wiring practices with magnetic timing control as it is more prone to EMI.
I tried that when the Sniper first came out and it didn't work very well. It turns out that the MSD distributor isn't a very good match for the Sniper. The MSD produces a sine wave signal but the Sniper wants a square wave signal which is why Holley developed the Hyperspark. The Hyperspark uses a Hall effect sensor to produce a square wave digital signal that works well with the Sniper. The Holley forum is full of people who have had trouble getting their MSD distributors to work with the Sniper. The common advice now is for people to sell their MSD distributors and use the money to buy a Hyperspark.
