Its expensive but this one appears as if it will fit on your front mounting datsun, not only that it is also an electronic distributor which should give you trouble free motoring for years to come.
http://www.ebay.com.au/itm/ELECTRONIC ... ories&hash=item2ec1064e99Item location is Australia so win for you!
Please note I am not affiliated with this seller, I simply am in the same boat as you and have considered this distributor as an option.