Yellow 78 911sc targa from California? anybody knows this car?

Hi, I´m new to this forum and have a question.
Last year I bought a long time dream a 1978 911sc targa in California.
The car has been repainted (not very good) in hellgelb (bright yellow?) and has a light brown interior.
The serienumber is #9118212222
The enginenumber is missing (replacement block?)
The trans has number #74G03139 and seems to be a rare Limited Slip differential

The car was last registered in Washington for about a year (according to the seller) but has no further history, also the speedometer was missing so I have no idea of exact milage of the car an engine.....
The car drives ok but I´m interested in finding more about the history of the car and his owners.
Bruno - Bredene - Belgium

The car been repainted, the original color was Talbotyellow as I found in a database together with some other stuff
Dealer UF=San Francisco
Date of invoice May'78
Color B7=talbotyellow
Interior 93=leather darkbrown,,seatinlays mclaughlan red
Options Y01(groupnumber contains)
- 474=Bilstein-shock absorbers
- 565=Leather steering wheel 380mm
- 566=rectangular foglights white
- 590=center console,
- 651=power windows and
- 261=electric mirror passengers side
- 395=forged alloy wheels front 6x16,rear 7x16
- 494=2 speakers rear,
- 496=chromparts black,headlamprings painted
- 559=cooling system

The airco seems to be removed

nobody ever seen this car? I' trying to find his history.....

Bruno, as this site leans toward older cars (older than the SC, ie longhoods from 64-73) yo might find a little more joy over on Pelican by asking the same question