[flatheadmurre]

For supercharged you want flow...so a larger transfer area is good.
For an engine like that takeoff/torque isn´t so interesting...you are chasing that last bit of horsepower...backing off just a notch to keep the engine from blowing up.
Running competition you will be aiming for a modern computer controlled ignition system...no need for twinplugs.
Good luck on setting a score !