I don't mean to put a downer on things because i like the idea of a 24v escort but if your coming on here to ask questions such as will the fuel pump be ok etc, i doubt that you have the skills to graft a sierra floorpan to an escort shell. As above just buy a tidy xr4i for say £3000 then buy and granada for £500-750 then spend another £500-£1000 fitting the engine yourself using decent parts along the way.. Job done, you now have a properly sorted xr4i that you'll easly be able to sell on in the future.