I did this mod a couple of times back in the mid to late 90s. If you use a 5 speed box from a MK2 fiesta its a straight fit with 1100 flywheel and clutch. You just need the Fiesta centre kit to move the tie bar over to clear the 5 speed casing. The 950/1100 only needs the inner skin on the innerwing removing as the engine sits over towards the o/s, however if you're converting to Kent engine in the future it'll need the whole wing cutting out. The kent engine moves the box over towards the n/s and as such requires a different cradle and driveshafts.