[Goober]

If you install either a KC or a Roush, it certainly will help re-sale value. Both are good engine builders and as far as power, their both similar. They both start with a Dart block and work their magic. I think KC may be a little cheaper for the purchase. A friend of mine here in Houston just got the Roush 427 and once he got the bugs worked out of it, it runs great. (Dynoed and tuned in Michagan, didn't like Gulf Coast conditions). KC seems to squeeze a little more HP out of his engines. Another option is maybe an all aluminum 427 from RDI?
Ask Doug Reed (DreamMaster)in New Orleans and get his feedback. Also Jim, the Dallas SPF dealer, just had a 427 built by KC.
Just my 2 cents
Mark