New to Mopar with a 71 Valiant Chrger

all our valiants had /6 engines in. we do have the Chrysler 300c rhd in SA. I am considering using a 5.7l hemi with its auto box from the 300c. it is cheaper to buy a complete driveable car than an engine and transmission.
It usually is cheaper to buy a complete car here too. You will need motor mounts, I suggest looking into the modern hemi swap threads for information.