I have recently dug my old MT2 T-15 nitro car out of storage and have done a bit of research and have my eyes on putting a g3.0 engine in it, I know I will have to buy the engine mount for it, and would like someone to shed a bit of light on other parts that I may need to upgrade, and links (if possible) of where to find them,

cheers.

I would suggest looking at official HPI manuals of mt2 t-15 and mt2 g3.0 and compare engine mount, clutch, flywheel, carb linkages, exgaust manifold, well everything that has some sort of connection to engine. As far as I know you will need engine mounts, flywheel, flywheel nut and that's all.