Heed the Pertronix website! First, see if they have an Ignitor (I, II or III) for that particular distributor. Then measure the primary resistance of your coil: If you use the basic Ignitor I, it needs a coil with at least 3.0 ohms primary resistance (inclusive of ballast resistor if your car has one). The Ignitor II or III systems however should use a "high-energy" type coil with about a 0.6 ohm primary resistance.
To go with my Marelli S118 distributor I got the basic Ignitor I because (a) it's cheaper than the fancier variants, (b) I can use my existing Marelli coil which happens to have a 3.6 ohm primary resistance; and (c) I can keep my points and condenser in the glove box as spares (they would burn out if used with a low-resistance coil).
Just received the Pertronix in the mail today so haven't installed it yet. Will report back only if it doesn't work right
To go with my Marelli S118 distributor I got the basic Ignitor I because (a) it's cheaper than the fancier variants, (b) I can use my existing Marelli coil which happens to have a 3.6 ohm primary resistance; and (c) I can keep my points and condenser in the glove box as spares (they would burn out if used with a low-resistance coil).
Just received the Pertronix in the mail today so haven't installed it yet. Will report back only if it doesn't work right