Yes in deed, they run strong as it is.
But there are some improvements to be made, if one wants to.
For instance the piston, itīs made on the heavy side and lighten it a bit will both free-up the engine as well as keeping the conrod more happy.
They are made to work much as a airplane-engine, they donīt have a god pipe to work with. So timing should be left alone if one doesn't want the process that comes with developing a good working pipe, or both performance and fuel-economy will suffer.
And I donīt believe there is that much to gain in that process anyhow...
Your probably better of lightning something on the chassis.
This was more done as a blueprint, not a mayor port-work.
As I sad before, I donīt think that conrod would like to see to much performance gains.
A happy engine is a happy owner!