Gen 3 426 into aussie a body

Just to correct you here, the engine is not in the center of the engine bay. It is angled across the engine bay. To properly centre it you will need to cut the trans tunnel and also move the transmission over. Then change your diff center location if you want to keep everything in alignment.

Good point Bakerlite , having the engine centered does not necessarily put the whole engine in the center of the engine bay . However there is some room in the tunnel to get it close , or center with some creative clearancing , the RHD Big Block guys do it often .
Also the K set up I showed does have some adjustability , one should be able to find a happy compromise .
Alot depends on the trans you want to use .

HemiDenny .
First of I will say I was impressed on the quality and price of the HDK set up , and was considering this for my car , however as you state , the cost of importing puts it out of reach for some people .
Our RHD steering box mounts on the inside of the right chassis rail (picture )