HEI ignition conversion
I did this swap on my 73 scamp with a 360 about 4 years ago and I have never had a problem with it. No ballast resistor, ECU or ignition box on my firewall anymore. You will over heat and fry the stock coil so just use a blaster 2 or a moroso coil. I also swapped to a GM one wire alternator while I was at it.
I did the same swap on my girlfriends 72 scamp with a 225.
http://duster.netfirms.com/tech/hei.html
This is the page that I used for a guide.