XE Dizzy's can be had anywhere for CHEAP. You don't need a computer for them but they do have an internal ignitor which is sometimes prone to failure so get one from an engine that was known to run ok. There are two wires which run to the coil (red + and green -). You can wire that up in under 10mins.
If you pull the dizzy apart to clean it replace the "white silicon grease" under the module with a product called UNIK or something from Dick Smith. It helps transfer heat from the module to the dizzy body which acts as a heat sink.
Just stating the obvious here, set your engine to TDC and mark the location of the rotor before you remove the dizzy. Makes re-fitting the XE dizzy that much easier. Then get a timing light onto it for a quickie tune up.