Electronic Ignition Conversion Kit from Jegs. Questions..

The "switch run" wire is blue 14 awg (or grn? forgot). The "start wire" is brown 12 awg (thicker). As I said, HEI is much simpler to hook up since you toss the ballast. That kit is old technology and problematic.

Did you buy it yet? That is a steep price to get electronic ignition, and a bit of effort. Another approach is a Pertronix Ignitor in your existing distributor. Model I $60 (old, w/ ballast), model II $90 (similar to HEI), or model III $120 (MSD type).