Agree with Mellis46.
If after reading that you're still determined, keep it standard but improve how it left the factory is the other way. Factory heads are a compromise
between cost and low manufacturing costs. This leaves plenty of scope for improvement. A bit of port to cylinder head matching and flowing will
give you horse power and torque gains. Doing this you won't ruin fuel consumption, but will improve it as the engine will be more efficient.
Fit new plug leads, iridium plugs use the best oil like Fuch Titan pro S or Millers Nanodrive NT+ and just enjoy.
