Why spend all that money when you can do the same with junkyard parts?
I worked with a guy to try this out on an old Valiant I owned and it works great. Grab a junkyard electronic ignition distributor, grab an HEI unit from a junked GM product (get a four pin, the seven pin is for fuel injection), and wire it up according to this diagram. The HEI unit MUST be grounded on the backside, otherwise this is a fairly brainless and straightforward swap.
If you have the original distributor for your motor, I would recommend swapping the wieghts, springs, and vacuum advance pod from your original points distributor to the EI distributor to keep the advance curve correct. Otherwise you might end up with an incorrect advance curve in the EI distributor.