Here is the original classified from the seller.
I got it from google cache.
1970 Chevrolet Camaro
And here are the different statements:
The German workshop (who fixes the car): It's a 305.
The seller: It's a 350.
The German "Agent" (who bought it): It has the ZZ3 Kit, so it has 350ci.
My Brother: "I want the ZZ3 or a comparable engine (350ci, 345hp)."
The rust part is solved, the workshop did all the work. And my brother wants that car, but not with a weak 305, because the reason for this purchase was the whole packet... incl. the ZZ3.