Is the Hurst Indy shifter for a Toploader ?
If so, here is a picture of how to do it from when I whacked one into my 351C XD.
The standard mounting kit for the Hurst Indy shifter is not even close to fitting into the falcon trans tunnels and consoles.
You can use a spacer block between the transmission shifter and shifter arm, but it is a bit dodgy.
Instead, you will need to cut and re-weld the Indy shifter mounitng bracket at an angle to clear the trans tunnel as well as bend the linkages to suit.
Superoo Falcon spares in Armadale or Performance unlimited in Welshpool normally stock these.
Have fun !!