You can't beat a 6al. Its the first thing I put on every car. No points to mess with, no spare mopar boxes, no resistor.

Find them on ebay for $100-125 all day.

Almost everyone I know that runs a grid carries a spare.

33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage