The Grey Area

No gray area. You've effectively ruined both VINs. If it goes to some states (like mine) it would not be able to be registered under the factory ID number because not enough of the vins match for either one. If you don't transfer the non-value car numbers to the rally dash and retain the right tag, it's a hacked up mess and would have to be registered under a DMV issued ID number forever. If you transfer all the high-value numbers, you've just rebodied it. Everyone has an opinion - this is mine: I want a car I like, and that can be registered. I'm not paying a premium because of pedigree. I'm too old to give a crap about them.