I am looking for some info/advice on what carbs I should get. I am building a 421 Cub with clean up port, Noss 20cc, Shearer SB inframes, +5 timing. I have been looking at the PJ's and PWK's and wondering what would be the best set up. What are the advantages of PWK over PJ? What is the differance between a standard PWK and a Airstryker PWK. What are some other similar models with similar pricing. Thanks