From the original auction listing, it simply says that Kurt Tanner got the car running again, and detailed. It does not say he did the restoration in the mid 1990s. Did your father actually buy the car from Kurt Tanner?
The "red paint" you found was the typical primer color for most 1959-1960 BT7s.
Also, 60 spoke wire wheels were never standard or an option form the manufacturer.
I think it is the original BT7 engine, just rebuilt probably with BJ8 cam and the cylinders bored. I can’t tell for sure from the photographs, but the carbs look to be BT7.
The interior is a BT7, not a BJ8.
Steering gear box was originally gloss black, like the column.
Feel free to email if you have any questions that I might be able to assist. I have a 1959 Concours Silver A-H 3000.