Well guys Kinkstaah was right, unfortunately the auto decided to let go during the upgrade process so manual conversion was the only choice. Decided to go the r33 s2 box just because it's younger and decided to throw a mantic twin plate in as well so when I go for more power it's all ready to handle it. The gearbox does need a rebuild as changing from 3rd to 4th, the synchro crunches so I'm guessing it had a hard life.
All up the conversion cost $6100. Would of been $1800 cheaper if I didn't get the new clutch. JMA Automotive in airport west was the guys I got to install it all and they have done an immaculate job. Thanks to Kinkstaah again for the recommendation to them they really know there know there stuff when it comes to Skylines. Here's a few photos of the conversion. Just missing steering wheel and cluster. Probably going nismo cluster and gtr steering wheel when I get the cash.
Hope to see you guys out and about.