Found yourself a gearbox I see! Nice.
they’re pretty sloppy in the shifter. Make sure you replace the shifter bushings and nylon cup on the end if they’re worn.
I actually made a short throw shifter when I had one of these boxes in my car. You have to make the end that goes into the gearbox longer, makes the shifter feel 100x better. I also think maddat sell a short throw shifter for these boxes.
I ended up putting a 71c box in mine, basically the same as a 71b box I think, it just has the nicer shifter mechanism used in sr and cr boxes.