5 speed gear box conversion help!!

Hi I have 1983 1.5 GL with the original 4 speed box in it, I would like a 5 speed for motorway driving. I have got another 5 speed 020 gear box with the smaller 90mm flange on the diff to match my car, im getting ready for the conversion but what else do I need?
I've read different things some people say that I need to weld a bracket on, some people say I just need different linkage and some have said that I could just bend my original so I'm just confused can anyone give me a step by step of what I need to get before I dive blind into it

Many thanks lee

Just replied on your running gear post mate.