Colour scheme doesnt add up either-- not a lotus with very late version of Coventry Climax V8 or BRM engine ( BRM ran both center & outboard exhausts in two seperate cars in one year of the Tasman Series ) .
Jac Mac
Colour scheme is Oz national colours, green/yellow and I think Black Jack painted his cars that way until they went into sponsors livery some years later.
Here's a link to a couple of pics and description of the BT24 with centre exhausts
Brabham BT24 - Wikipedia, the free encyclopedia