How did you verify the VIN? In 1968 the VIN would
show the GM division (1=Chevrolet), the series
(3000=Chevelle, Malibu), the model year (8=1968),
the production plant (1 or 2 is Canadian built. A
letter in this position is US built), and the last six
numbers are the sequential unit number of your car.
There's no engine code or SS designation in the VIN.
But since it's a replacement engine you could have
just about any GM V8 in there. You'll need to
research that part number you have and find out
what it is. Buying replacement parts will be much
easier that way. You might try a Chevrolet or
Chevelle specific website. Maybe somebody there
has a parts catalog that shows your part number
and what the engine is and what it fits, the years
and models of vehicles. Hope that helps! Jim