It will be stalling everywhere. I had the 403's with the gears untuned at +2/-2 for a while and it was not pretty. Any time the weather was over 75 degrees, it died a lot. And this was in San Luis, little humidity. Anywhere with humidity, the engine will get even less air and stall ALL OVER THE PLACE. If you get the 404's/springs/retainers/S-AFC/cam gears/FPR all at once and dyno tune it all, it should be OK. But if you just wanna throw some cams and go fast get the 403's.

I believe I'm the only one in this thread who actually has Crower cams btw...