Nostradamo

So I’ve been gathering info in adding megasquirt to my stock non turbo 1983 280zx. Hoping to get more horsepower. Many mixed answers on forums. I’ve left a message at Godzillaracing regarding megasquirt a week ago for some info. Without wanting to ADD a turbo route would megasquirt do the trick or should i …..clean/replace fuel injectors,check on fuel pressure-add a guage, retard timing a bit or? Car only has 30k orig miles. Was sitting for 15 yrs. Now on road for few years. Thanks