There were several which can be considered correct, but some are considered earlier designs- obviously appropriate for early build cars while others emerged later on as the business flourished.
Some of the more correct and popular designs look like these below. Note they are used to show the designs and I make no comment about subtle differences or lack of correct font and such between the ones pictured and real one.
Understand this, those stickers are like all th other ones you get with your parts. They are used to promote the product or company. The cars that they knew were going to be featured in the magazine got the special sticker treatment.
The Dyno tuned ones may have been reserved for cars which actually were dyno tuned. Speculation on my part but I'm sure there were still exceptions to that even if it was their policy.
What did you have in mind for the decals?