Spark Plugs

I have a 1979 Spider with the fuel injection replaced with Webber carbs. I would like any recommendations for american spark plugs that any of you have run in a similar application with good results. Thanks

I swapped from Golden Lodge to Bosch Super 4s and it's made a huge difference to ease of starting with no detriment to performance. Apparently the Bosch draw a much lower voltage at start up and are much less prone to fouling. The Bosch reference is 504 or WR 78X depending on parts lists!