Not sure about the USA, but in Europe the Certificate of conformity and hence the registration document is different for LHD & RHD M3W’s. Having said that it’s not a difficult job as, as you say, the chassis is built to accommodate both options. Whether you can get the required parts out of Morgan is another issue. You main parts you need are a new steering rack, new dash board backing, new dash panels but pretty much everything swaps over from memory. I left the handbrake in the same place as I didn’t want to mess with the upholstery, you can chose whether you want to change the steering column cowl etc. By looking at the parts book you can see the LHD v RHD specific parts.
