matching up engine number

[Innuendo]

You would need a block made according to the cast time stamp up to and around 3 months of your build date (obviously not after).
For the real engine number, it is written in the Owners Manual/Service Policy and is why car with them are more desirable and likely more valuable.
I report from www.holdenhistoricalservices.com.au in some cases will let you know the engine number (if it was recorded).
Being a HJ 308 the engine number will start with QT.

[porkhunt22]

Thanks once again Innuendo, where is the cast time stamp located. I have a photo that reads 28L5 but I cant see in the photo where it is located. Looks to be in front of intake at the front of the block?
I guess QT is designated for all HJ series and there is nothing different marked between the model ranges Belmont up to GTS or a Sandman?
Does the prefix 11 have any meaning?
An engine out of a Kingswood with the right time stamp will be authentic in a Sandman?