Good day a1dirk and welcome. You say you are in Cali..., I`m guessing that equates to California in the USA, If I am right you can find original Lister CS engines on ebay, craigs list etc. They are generally worn out and you will need to spend a lot of time and money to restore them.
If you aren`t up for a project contact Gary at Diesel Electric for a Lister Clone or 38ac for a rebuilt original or clone. Sadly the EPA regulations make it difficult to import engines and illegal to advertise them if you do.
Good hunting, let us all know how you go.
Bob