Not a Dakota but a Maule M5-235C with an O-540.
Most Dakotas (?all) have a carburetted engine and so has the Maule.
Sticking a £15k new or overhauled engine in an aeroplane but skimping on an engine analyser is incomprehensible in my estimation.
Unless you are very lucky you will not be able to run the engine LOP.
But an analyser gives important information and if you go for the option with the fuel flow bits you gain some very valuable insights on what is what.