hello ! I have a Volvo 340 with intentions of putting a Volvo 440 1.7 turbo engine into it what gear box and diff would/could I use ? HELP

The ones that are in the car at the moment?

but will the diff and gearbox and prop be strong enough ? ive got a 1.4 in it at the moment and don't think it be strong enough

What are your goals? Prop will not last but the gearbox and diff will hold up to about 200/250 bph.

somewhere about 130/140 bhp ish intentions is to drift it and learn in the 1.4 then go for the 1.7 turbo

The main thing you will need is a prop upgrade, the gearbox will be fine but any gearbox can break when drifting. You will also want to add a second torque arm to the back axle.

You will need a lot of 1.7 engine parts and bellhousing to fit the 440 engine