I agree, but you have to consider that aviation fuel also has a different vapor pressure level that standard road gasoline.
We now run 100 octane low lead fuel in all of them, but the tetraethyl lead in the fuel is a necessary component of the valve train for stem lubrication in air cooled engines.
The other downside to the LS in an aircraft is the liquid cooling system as well.
Recip aircraft engines are generally slower turning than their land based counterparts.
The reason behind that is to prevent the propellor tips from stalling as the blade goes supersonic.
As the RPM increases, the stall, exactly the same as a wing stall will travel towards the center of the prop.
The counter effect of that is reduced thrust, which an prop plane needs in order to fly.
Anyone that has ever been to a prominent airshow has experienced that as some aircraft pass by with a raspy note to their sound.
The LS engines are very sound in the low end torque department, but would likely benefit from a gear drive that adds more weight to the powerplant which in turn reduces the useful load of the airframe.