I have a 12/71 240Z. The shifter that came out of it is straight with threads on both ends. After looking at many threads, can that be right? I have the opportunity to cut my tunnel now. I'm putting in a f54 block,83 close ratio 5 speed. After reading many threads, I don't know what will work.(shifter hitting tunnel, console). I read where I can use 240 shifter without cutting tunnel. Which brings me back to the first question about my straight shifter. Any info or help? Thank you very much, TimsZ

Sounds like a Type A 4spd, probably original. You'll need to either bend into more of an S shape or use a Nissan competition shifter.

Search the site, many more threads with more detailed info than I can provide.

There are a few threads on this site that give a detailed description of shifters and tunnel work required-with pictures. I'm not being lazy or flippant here, but I am on the iPad and it is harder to find and post the links (at least for me) than when on the computer.