the metal in the deck lid has keyed slots that should allow the lock cylinder to only go in the one way. if it was damaged at any point in the past from someone trying to force the cylinder, the entire housing could rotate, however I can't see that it would still actuate the trunk release mechanism correctly.
if it actually is your lock cylinder itself and not just rotated in the deck lid, any good locksmith shop can duplicate a key from just a lock. I've had it done before. only problem is they have to cut the face off to pull it apart and the replacement one he put on looked a wee bit cheaper than the original.
keep in mind the trunk lock key is also the glove box or console key (at least it is in 67-72 cars, I never had a 64.
also, if you still have your original lock that you changed, you could also just have that cylinder changed out to a different key code at the locksmith as another option to get rid of whatever chinese cylinder you replaced it with.
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