I can only relate experience on a 70-72 Chevelle tunnel, but have tried every shifter available, from old Comp Plus, to Hurst Vertigates, to Hurst Super Shifter, and even a Dale Earnhardt Nascar billet Super Shifter, and what I'm using now, a Long Vertigate. Any straight line shifter will require tunnel surgery on a Chevelle, and others probably. Depends on the diameter of rods, whether you are using heim joints, how much surgery, tunnel clearance is very close. Have had to cut all the way to the gas pedal on some.
Have owned nothing but 3 pedal hot rods since the 60's. PITA, but worth it.
Youtube is with a H pattern Super Shifter.
https://www.youtube.com/watch?v=5vMnf7EugAo
https://www.youtube.com/watch?v=oWk9NdlWxvM