1968 Dodge Dart GT Front Grill -> 1967 Dodge Dart GT

Jan; I own 2 68 Darts and resto the 68 Dart Grilles on Ebay. The 68 Grille will fit exactly into your 67, but the taillights will not. You cannot rework the rear quarters to fit the 68 taillights, unless you swap in 68 quarterpanels.
67 fenders & hood are also interchangeable.
PER 69 DART: Nothing exterior, except the doors will fit.
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My advice to you: KEEP YOUR 67 ORIGINAL. 67 parts are cheaper than 68/9 and are plenty available. 67s are very Cool Cars and are more popular than the 68/9, once done up Nicely.