If you're not running an extremely aspirated race engine with 400+hp why even bother with K+N? I'm not one to follow the crowd but I agree with the general consesus on this board that K+N is extremely overpriced for a "just okay" filter.
However, if that 427 needs the 550 psi burst strength of a K+N then get the JEGS catalog, I think the 6002 runs about sixteen bucks. I use to run a HD Moroso on my crate 425, but for a couple of bucks cheaper I could get the K+N with a thicker shell and an extra 125 psi resistance, not to mention a nifty end cap nut.