440 / 727 swap in a 73 duster

It's LHD currently, but I'm converting it using a local VE Chrysler Valiant dash and firewall with an aftermarket RHD tubular k frame.
The VE / VF/ VG Chryslers we have down under are basically just a RHD Dart Swinger which makes it really easy.
Pretty sure you're looking at a custom exhaust then. NO factory manifolds will fit a RHD big block A body, and header selection may be limited to only a couple of Aussie-specific offerings, if any. But I'm sure you've got that covered.
How are you converting the steering, bolting the Aussie box to the RH framerail (will need reinforcement), or going rack & pinion?