Ivo, this is the suicide hot line calling... can I talk you down from the roof? Please step away from the edge!
First, why do you want to put a GM distributor on a Ford? You profess that "I'm completely new to the electrical stuff". The new distributor and coil won't make any noticeable difference. It won't make your car run better, and frankly is probably a waste of time, money and effort. The stock OEM system was used in racing these cars back in the day, and the new parts will not improve on that. I'm an electrical engineer and know from a lifetime of experience that every step away from stock is a step in the direction of generic and unproven parts (in your application) that will lead to unintended consequences. The HEI was developed in 1974 by GM because of mandated emission policies. A 69 does not have those issues. It is true that the HEI is able to deliver more spark thanks to the electronic ignition-control module, but so what? It simply isn't needed. Send the stock distributor out to be re-curved if needed, and learn how the weights, vacuum advance, and timing affect engine performance. This can make a huge difference.
Second, since you are "completely new to the electrical stuff", don't change to a one wire alternator. The alternator of choice for a true upgrade to these cars is a 3G. That's the third generation of Ford alternators, and it will charge at a lower RPM. I understand that ONE wire sounds easier to install, but it is not an improvement. Check PA Performance alternators, and keep in mind that more amperage is not necessarily better. If you go over 95 amps it will take more power to turn the alternator- more power than a single v-belt can apply. You will need to go to a dual v-belt system, or a serpentine system. The serpentine will require dumping the old fan, using electric fans, and changing all the pulleys and mounting brackets on the front of the engine. The electric fans drag a ton of power and require an even bigger alternator. This increases cost and is unneeded if you go with a moderate but true upgrade of only 95 amps, which is probably 3 times more than the stock alternator. You would be surprised how many people complain about issues with their aftermarket serpentine belt system. Yes I know that some people will say that they use a single v-belt, but PA Performance deals with the complaints on a daily basis, and insist that it should not be done.
Just my unsolicited two cents.