I tried a set of the nascar autolight plugs without a strap and wasted the first 2 races of the season chasing a inconsistency a couple of years ago.

Never again - I'll stick with my tried and true NGK's.

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