How would i replicate a chorus fruit if it was instant

First off, I recommend that you understand what local variables are, and that dependencies are not variables that can be overwritten - I say this because it looks like you are trying to use the [x], [y], and [z] dependency blocks in ways that will not work for the current application. I have created a procedure which can be found below that is quite intensive in that it checks every location in a cubed radius until a random roll of 2% is reached, or until each position has been checked. This does cause some momentary lag which will increase exponentially when the radius is increased. The radius can be changed in the first line (it is currently 10).

This will also only check if the blocks are not solid, but you can change these condiitons how you wish.

When you are in the procedure look at the top right of the window. There is a field with a green plus and a red cross. Click the green plus and select 'number' when making all of the variables for this procedure.