Hugh, its easier to maintain originality on a car you do not drive daily. Many of us are combining our "hobby" with daily transportation, so we do not have to "waist" our money in modern cars (which I have expressed few times how much I respect them!). In this case, functionality is more important. Most 68's are equipped with Carters rather than the original Holley (in fact my LeBaron has a Rochester). I 'd rather have reliable Carter (my Sedan's Carter never had any problems through the 70K miles of my ownership) rather than a leaking Holley. There are many other examples of deviation from original. Imperials were good cars from the factory, but not perfect. On the other hand, there is a practical reason to try to avoid excessive deviation from originality. The reason is that the after-market parts are often not comparable with OEM in terms of reliability. So, that's one of the reason I drive Chrysler products: because they were properly engineered from the factory and meet my needs better in terms of performance, handling, etc. So, the need for "improvements" is relatively small, compared to say a Chebby. Bottom line, Imperials for many of us are machines that serve us, not the other way around. We like their distinctive looks, performance, and safety but also we like/need to drive them. In fact, all of the above are irrelevant if the car sits for 3 months at a time waiting for the "original" carburetor, or original oil filter, or.... Unlike say an "original" Corvette, or Cuda or Cobra, Imperials are useful and practical machines that "earn" their living by serving their owners. So, the term "purity" is a relative term. D^2