minimopar.knizefamily.net/perf/index.html
Sure. It's not really a 420A site, but holy damn is there some good reading to be had there if you're into turbo. Some of it hasn't been updated since 1999, but still very informative about some of the older 2.2L and 2.5L Mopars. Thought I would share this in case no one has stumbled across it yet.