Hi,
For main street sat nite show-off :NGK BP7HS or better the iridium equivalent.
For exactly similar performance without the bling: Champion L87Y.
The little secret on ignition: get your dizzy innards and coil from Martin Jay, the distributor doctor. Real magician, nice guy, correct prices. rebuils 'em too.
The big secret : NO electronics.
Ask the man who just passed the 40 years mark at at the wheel.