If you have a shop manual use it to adjust the linkage. If the adjusting doesn't help you may need to have the shifter rebuilt or buy a new one.
If you don't have a shop manual get one.

If anyone is interested I have a complete Hurst Indy Shifter setup for sale that I took out of my car. It works great and has a nice handle, boot and white Hurst ****. It moves the shifter forward and to the side so the tunnel needs modifying. It's a nice short throw and looks cool. The only reason I took it out is because I have a console I want to put in. Seventy-five bucks plus actual shipping.