Mate i would Honestly steer away from the 6.5 Chevy diesel as my old man did the conversion and the engine shit it self just after the warranty run out then he was up for another 10 grand after forking out $22k for the initial change over and then not to mention a few of his mates having same issues so you see alot of them for sale

The 6.5 chevy diesel engines come from mexico so crappy parts and cheap crapy blocks are used

Thats my opinion i have a td42t and cant reccomend it enough such a strong and reliable engine u couldnt go wrong