Never save money on ignition unless you've got a spares or all the info.
Everything addo has said is spot on becasue it'll give you years of relioable service, and its easy to get parts for these so called '64' ignition systems
Heres' the rundown on Aussie Bosch ignitions.
Most Ford non cross flows (such as the 221ci) ran code 9230062606 (so called 62 series Motorcraft. It also ran a C8 12100 Motorcraft Ford code.
Then the there were the XA to XB 9230062604 (still a 62 series) with a 72DA 12100 code, stamped Motorcraft
Then there was the XC points 9230062623 and later XD points 9230062651
Ford ran some 63 series items in the V8's, similar to all of the pre HEI Holden 253/308 and local 215/245/265/318 Valiant units after 1976. Holden ran Lucas systems on there Holden sixes until 1976 to 1978, when the Bosch '62' unit found favour.
After that came the joint small cap Holden/Ford '64' series electronic, found in eveything from 3.3's to 4.1, 4.2, 4.9, 5.0, 5.8's. If it had a Motorcraft part number, its a Duraspark. If its just Bosch, its a Holden HEI. This means that Bosch Australia made lots of very similar parts for a small market.
Great thing is that means there is a huge array of parts around if you know where to look. Even the USA make parts for it, such as the Pertronix I #1865 unit , or the less reliable #91865 Ignitor II
The old trick was to run the Bosch conversion kit in the early 80's, where you could use one 'Ek 60' kit for every Falcon Holden or Valiant that had the Bosch '62' points distributor.
Somewhere, some at Bosch decided that we should buy the late 1980-1988 XE or XF or Holden XT5 (BLUE) or XT6 (Black) '64' series distributors instead, because they made the conversion kit unavialble. What is really funny is that the Camira/Nissan Pulsar/ Astra/ Mitsi/Holden 304 ignition coil unit looks like it is exactly the same as the early aftermarket Bosch unit!
The ignition stuff in Aussie is really the best around, as our Bosch/Motorcraft/Holden/Valiant stuff is very similar. They are compact, easy to get bits for, and are robust.There is little diffference between the later 64 sereis HEI/Duraspark to the earlier 62 and 63 series, with some of the vac advance units practically the same The HEC (Holden Engine Company) coil and any of the more common vacuum advance units are around, and the Holden stuff was bascially Fords Australias Bosch made Motorcraft Duraspark unit, but with the Holden shaft and alloy body on it. I can't think of any reason why you would skimp on spending 250 bucks on making an XE Ford Falcon unit fit .
I'm using the Pertronix 1865 one on my Cortina because I'm running the early XD points distributor. After mid 1980, Ford changed to the early US style 0.490" dia shaft so they could package the electronics in sde the stock Ford distributor cap. Before 1980, all x-flows and non Xflows ran a 0.530" dia. shaft. Crow Cams make two gears to suit either the post 1980 electronic, or the earlier points ignition. Part numbers are
DG2 Suit 6 XD on with 0.490" dist shaft.
DG2A Suit Falcon 6 points dist. with 0.530" shaft ,
A well run-in stock gear will work just as well, and is cheaper.