Remove the furler and keep the same jib? Or remove the furler plus jib and replace with a racing sail?
The furler must lift the tack of the jib. Has the furling jib been cut differently to allow for this? Generally racing boats will try to get the tack and foot as close to the deck as possible.
Changing (lowering) the height of the tack would alter the height of the clew, and therefore the angle of the jib sheets, and therefore the jib sheet lead will need to be moved forward to keep the same optimum angle.
If you are changing the jib, then the halyard length could well change anyway….