Well, there's a few Porsche VIN decoders like this one here:
Scouser's Porsche VIN Decoder
it's interesting; the VIN says it's an '84 ( but as you've pointed out the 3.2 has been replaced with a 3.0 litre engine), the pictures provided show it has an 83' (and older front valance w/fogs) and the steering wheel appears to be from 85' and up and it has a rear Carrera badge ( though these are easily removed & replaced items).Is it true that PO really did in fact replace a 3.2 with a 3.0? Any pics of engine? Is it possible to be a very early production for model year 1984? 
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76'S 1st Porsche white/can/can early rebuild (boo) 
'84 Carrera cpe. all blk & stock 340k never a let down (might have been the best1) 
'87 Carrera cpe white/blue short flirt 
'89 Anniv. sil/linen very pretty miss her 
'88 928S4 5spd. blu/blu cmplt.SS exh.chipped lowered 
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