mgb gears

I drive a 1975 Mgb and am entering luffield for the first time this year 2018. I have driven my car last year at Harewood and Curborough but not in the Luffield and I find the gap between 2nd and 3rd gears on the standard box too far apart.
So I have the following questions if anyone can help?
1. Is anyone else frustrated with this problem?
2. Has anyone experience of using a close ratio box for speed events?
I would appreciate any comments suggestions etc