have you got a 1.3 at the moment?
from 1.3 to 1.6 motor.........
engine mounts are in slightly different positions on the chassis, so you have to either drill some new holes for the bolts, or get some adapter mounts.
the 1.3 gearbox fits the 1.6 motor but you need to drill some hole in your gearbox, unless you get a adapter kit/plate
with the carby models you don't need a body lift but it's a tight squeeze.
I don't know anything about the efi computer stuff though
