904 Floor shifter conversion questions/help

Here is the one I had years ago in my 67 Firebird: http://www.summitracing.com/parts/bmm-80675/overview/
This thing is very heavy duty, works smooth, awesome, can be used as a normal floor shifter ...or put it in ratchet mode for more performance. Only about $50 more than the one you are considering, but You will love it. Guaranteed!