Money can get anything done, But basically the whole front end susp need to be changed out, all the hubs would have to be changed out to the g37 hubs, AWD module needs to be riged up, and linked to all 4 wheels inless u want 4x4. The g37x transmission/subframe needs to be swaped in. You cant use the manual trans, unless u run a drive shaft from the tranfer case to the front, but attach it to what? it cant be done, You might aswell sell the 370z and buy a g37x if u want all wheel drive. Inless u want your z to be automatic.
I know this first hand, because ive had a g37x transmission assembly on the floor of my shop, had the Z up in the air, It cant be done with the manual trans.
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