Tack pin setback will no longer be proper so you'll have to work
around that. Make sure you get the sailmaker to have a look at backstay clearance. On one boat
that we replaced the main after another sailmaker converted it to full battens and added a Battcar system. At that point the sail could no longer be tacked or jibed without lowering the sail. Sometimes there's more work
than you think converting to a track system and it's best to simply wait until you replace the mainsail
. Unless it's a fairly new main why dump a bunch of money
into a sail that's not a very good sail?
If you don't already have full battens you may be able to reduce friction to where you don't need a track system.
PM me with questions if you like. Good luck.