Well I did a little digging and apparently this is a swap people were trying with some success on hemi trucks although I didn't find many dyno numbers/track times. It was relatively inexpensive getting parts through a dealer but for some reason dcm put a hold on selling 6.1l parts except for warranty work? There was some conflicting info about the valves being shrouded by the smaller bore or not. You also lose mds with the srt cam. Hopefully the knowlege base will improve when the challenger hits the streets.

On a related note I've also been looking at new camaro info and Gm performance parts has made available heads and intake for the new 6.2l l92 (ls3) motor as an upgrade for ls2's These are very similar in design to ls7 and flow up to 330 cfm out of the box! Under $800 full assembled for the pair and $475 for the intake with inj,tb,fuel rail.

On the dodge sites there was some conspiracy talk about the parts hold, so if one company's going to support tuners and the others going to block them it could affect my purchase.
Maybe just a supply problem.