[Ignition coil resistance, ballast resistor]

I think you I'll find that a typical 12volt coil, with external ballast resister will have a primary resistance of 1.5 -2.0 ohms.  If it has an internal resistor, it will run around 3.0 - 4.0 ohms.  In both cases, the the secondary will be around 9000 - 10000 ohms.  High performance coils will often have a lower primary resistance, and should not be used with your points system. 

If your car is a later model and has an SBC high energy system, the primary will be around 1.0 ohm.

[How to install electric power steering]

I've been procrastinating for a couple years on this because the area under the Avanti dash is fairly small, and the electric PS units are fairly large.  Do you have any pictures of the under dash install, and does it interfere with your feet at all?