What coil and wires to use.

As for the coil;
I have had excellent results with the big yellow square-top Accell Supercoil.
Easily goes to 7200 on the Street, idles all day, and mine is about 25 years old now. I run mine off the battery, thru a relay, that is turned on by the ignition switch; so the power is not going thru the bulkhead nor the ignition switch.
It needs it's own ballast-resistor.
But that sucker is too big to mount on the intake. Mine is on the P-side apron with a long Coil-wire, part of my anti-theft system.