Looks like a very nice Monte, but I doubt it is a 1978 car regardless of the documentation. Its buttresses and it's vin number suggest that its a 1976 car. There's some info on it on the "other" X1/20 forum with the .net suffix. Its thread was started by Username Boxterman. I helped point him to the only reliable source of dual carb manifolds I know of that will fit this car (Pierce Manifolds). The manifold was designed for the beta Coupe but can work with some modifications on the X1/20. Blue on red is a bit funky for my taste, but that's a small quibble for such a cool car.
this light blue shade was common on fiat 126s, at the times..dont know if it suites the montecarlo tough