Another welcome from Sheffield. If its a 2.0 type 4 you can get the bulk head out without removing the engine
Depends on what type fuel sender you have, if it's the early type not sure you can ...should be ok if it's a 79 but if you are doing the breathers just take engine out and do it with ease, it's a beestard doing them with it in and they canbe tight to fit putting the new ones in .