i was tossing up gze turbo with w series. its to dear when you add everything up. i dont really think its worth it. the gearbox setup alone is almost $1k. plus engine. plus rwd inlet. turbo.
i dont think its worth it if you are starting from scratch.
reason i diddnt go down this path in the past.
ca18det engine gearbox package $1200. same amount of work as 4a turbo. same power out put. gearbox is strong enough.
as said above 4age. better option.
i decided on beams over 4a turbo. i dont think it will cost much more than the 4agze turbo (done properly)