Just a quick note on the fuel thing, some engines use bronze heads, others aluminium alloy.
Depending on your version dictates fuel suitability. Bronze heads use Mogas, ( motor spirit 78 RON)
The reason is that high octane fuels 100 LL and above can cause pitting erosion adjacent the valve seat in the combustion dome ( if used for extended periods)
The culprit being the tetraethyl lead additive used as an anti knock additive. Aluminium alloy heads don’t suffer this problem due to its metallurgy. These alloy heads can use both fuels and benefit more from avgas generally