Hi there, I thought I will shear my knowledge with ts 2.0l motors.
I have installed one in my 1972 Giulia Super with pistons cams, intake for carbs and header from Alfaholics.
The head is improved, but uses 44/38 (intake/exhaust) valves.
We use 45 Webbers and a HPV1 Direct ignition system. The comp. ratio is 11,8:1 and drive the car on and off track easily with great performance and results.
In the dyno the engine showed 195Hp at 6.750rps with 22,3kilos torque.
The car weighs 1030kilos has 10:43 LSD and it is super in everyday traffic as well as on the track (videos below).
Definitely the best engine for 105 series car to have fun on and off track but definitely not FIA for GTAm replicas even though the cylinder head is 95% similar to the father (GTAm).