I don't know.. 350ish SAE rwhp out of an A4 with stock heads on any cam is very (maybe overly?) optimistic IMO. The heads just aren't very likely to facilitate that kind of result.

 

I love the 306 too because I leave them in the dust

 

I bet that 1.5 60' wouldn't have anything to do with that now would it?

I think that the hydra rev helps you out quite abit because the xe cams are so agressive its hard to get them to rev high with just good springs.

 

I may have to disagree about the rev kit. I have a ramp that is more aggressive than the XE and experience no float. That 60 definately helped and is great for stock heads