As for steep hills; well, it taught patience.
Beetles with automatic transmissions were rare.....another drawback imo.
I think they brought out the 40 hp engine in 1965. Before that, it was 36 hp.
I would guess that 75 hp would be adequate for a 2000 lb. car of that era.
Used to drive a 1965 Austin 1100..49 hp...manual. Lots of pep and a hoot to drive.