Dso 89

my brother in law has a 1970 mach with a dso of 89 and the car is slightly different from other machs. the stripe on the hood where it should say 428 is blacked out and it has an aluminum intake manifold and 1969 valve covers. on the invoice it says it was sold to an engineering group as part of the ford moter co on 08/69 what does transportation services mean? is this a promo car?
 
transportation services is the group that provided cars to the Ford family and executives of FOMOCO, i beleive that was their primary purpose, but they also did pre-production show cars for big shows like the detroit auto-rama, etc.