I will assume you have twin outboards, and the fact that you aren't running a Performance type Prop, in fact the Prop shown isn't either for that engine, or some adapters are missing. No it is not the correct height
Sorry for not providing more info.
It's a kicker on my 67 18ft StarCraft.
I have a 75hp as the main.
It's a 9.9 Yamaha with a high thrust prop.
It's the stock prop.
.
I was thinking of lowering it some to get the Anti-Ventilation Plate fully below the lowest side.
Plate height is only critical at planing speeds, when going at displacement speed for trolling, not critical at all. Looks about same height as my kicker..