I was planning to do the same between a Rover V8 and an automatic 1800 box.
That's actually old news !
ADO17 - https://en.wikipedia.../wiki/BMC_ADO17
" As a one-off engineering prototype, to test production viability, an Australian 1800 Mark II body with subtly extended front guards and modified front internal structure was fitted with an early Rover 3.5 litre V8 mounted in the "North-South" position in the engine bay and then through a complex mechanical system, drove a heavily modified version of an "East-West"-mounted Borg Warner 3-speed automatic gearbox and Austin FWD differential. This car became Australia’s first locally-made FWD V8 car. The car was built by BLMC (Australia) at its Victoria Park works at Zetland, New South Wales."
Not sure if it's mentioned in that article, while it was 100% developed in Australia, the Engine & Gearbox are now in the UK, not sure where though !