my rs turbo engine is out due 2 the bottom end needs changing,

can i use a xr3i bottom end? if so wat else do i need to do, sumthin about the oil return pipe?

might put zetec bottom end in as well, but garage said i wud need a uprated gasket costing around 140 quid, cudnt i jus use the normal gasket if i went zetec? cuz the garage is sayin it will burn up/fcuk up after few miles???

need sum answers as soon as ya can, cuz my rs turbo is engine less, just big gap were the engine shud b
cheers