I held schools around the Midwest anouncing the"New 49 Buicks" The 49 Super I used had a low-profile deck-lid. A short time later they came out with the newer deck-lid. The very first 48's had a rubber grommet around the steering column just below the speedometer,but shortly they put a chrome moulding there to replace it.A few early 49 248 engines (in synchro-mesh cars) were actually left-over 48 engines,even having black decals on the rocker-cover.When these engines were used up,the 248 engines had the red lettering on the rocker cover and wege equipped with insert rod-bearings and hydraulic valve lifters.I can qualify being an "Expert?" at least partially. The total definition of expert,-- An Ex is a "Has-been",and a Spurt is a "Drip under pressure" I am no longer under pressure.