Will the 3.9i engine and autobox fit my 110 V8

Hi - I am changing the 3.5 V8 engine in my 110 V8 for a 3.9 V8 from a Range Rover Classic and would like to change my 4 speed gearbox in my Land Rover for the Autobox from the Range Rover. Does any one know what else I need to replace please.

My Land Rover 110 3.5 V8 is a 1983 County Station Wagon on Fuel Injection and is on LPG.