408 cam / build help.

This is a good idea, build it drive it and save up. Once you get the money saved, if you're anything like me, it won't be enough power anymore and you'll want more. Eddy heads will probably be enough wake up for it to satisfy that craving for more power
I can agree with you 100%, I have a 360 in my dart now making upper 200s low 300s and it already feels slow to me