Greetings, Could use some advice,

My friend is interested in this Caltar II N 90mm lens. I'm not well versed enough to answer some of his questions. He wants to use it on a Tech III.
So my basic questions are:
Will it fit?
Will he need to change the mount board? (Currently on a board used by a Tachihara)
Since it is so bright of a lens f4.5 is it a sharp lens, and what performance at what f stop do people get?

Thanks for any input,