No, but you can ditch the Magnavox single-coil setup and switch to the AC Delco Type II system, then put on S2 (97 and newer) ignition coils. That should give you a noticable improvement.
The only way to increase spark voltage is to either boost your alternator output (slight gain), go to hotter coils (better gain depending on year), or switch to a standalone MSD ignition system.
There is no power to be gained unless you have a weak spark. Hotter spark doesn't generally mean more power unless you need a hotter spark due to other mods.