As long as the 320 is in good shape (not rusted, etc), then I would look at using it since you have it already. Just picked up a 1620 myself for a future project. What luxuries are you giving up? You can always add clutches, air gauges, etc if you want them!
Can't help with the install as we don't have a Brandt harrow...
Andrew
Can't help with the install as we don't have a Brandt harrow...
Andrew
