I converted a T3 to T9 a couple of years ago
I had to use the mount from the t3, as the t9 mount was too wide to go in the tunnel
the frame plate will likely have to move back if IIRC, the distance from front of gearbox to mount was about 5" more for the t9
also the t9 is fatter at the back end of the box itself
I assume it's a Ford engine, I used the BH3 bellhousing from Burton, and the shifter came up perfectly in the old location
I used the concentric clutch slave unit
do you have the correct input shaft on your t9? you need the short one you can modify the long one
the front end of the input shaft should be even with the front of the bellhousing for a xflow engine
Charlie