HEI conversion question

Couple of comments.
- p/up wires can be quite long & small gauge, as the current & voltages involved is very small.
- as others have said, keep the wires away from HT leads AND from the coil [-] wire where the back EMF can reach 250+ volts.
- twisting the p/up wires & keeping them close to a ground plane is a good idea. A better idea is to use screened cable like microphone; ground one end of the screen. I use MC cable as my ign system is mounted under the dash to keep it cool.
- you cannot have a heat sink that is too big, but you can have one that is too small..
- the original white heat conduction paste used to transfer heat to heat sinks contains beryllium which is known to be cancerous. There is now a silver paste with silver in it which transfers more heat as silver is an excellent conductor of heat & electricity.