If anyone is wondering about how to convert a Flavia 1500 into a Flavia 2000i, here's one that someone else did earlier.
https://www.classic-trader.com/uk/cars/listing/lancia/flavia/flavia-1500/1963/60255Some jigging about to accommodate the air filter and brake servo.
Also looks like the interior heater and air ducts to the feet have been sacrificed in order to accommodate a larger five speed gearbox intrusion into the cabin. Not a modification for the faint hearted or penny pincher. Certainly not something that I'd want to do, but the paint job looks lovely!