Hi Iain
The chances are you'd need some quite thick spacers to get them to fit behind the 14" alloys over standard disks. What model car have you got? As then I can look which diameter/thickness disks it uses.
Usually the caliper will sit around 50mm out from the face of the disk so that's the sort of clearance you'll need between the face of the disk and the back of the spokes of the wheel.
Also, none of the Wilwood calipers will bolt straight onto the Civic hub and need a set of brackets machining for them, this is something we can do, as well as make the spacers if needed.