Have to say I really don't like the looks of the TTI turn downs on the A bodies. They stick out too far and hang too low.
On my 67, I cut them off and put aftermarket chrome tips on that snug up to the valence. There's a small cutout on the driver's side of the valence and none on the passenger side, but you have to look really close to notice it. (PS: I've put a new AMD rear bumper on it since this pic was taken.)
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On my 65, which was originally a Commando 273 with a square cutout on the driver's side, and a hack-sawed square cutout on the passenger side that I did with minimal know how and tools back in the early seventies, I cut the tips and a couple feet of pipe off and spliced original 69 A body tips with Walker replacement tail pipes into the TTI 2.5 inch tail pipes. They curve upward, pitting the tips in the right place. The TTI tips hung below the rear valence instead of fitting up into it.
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From above:
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If I had your Dart, I'd just cut the tips off and run some aftermarket chrome straight tips or turn down tips, whichever you prefer. You can let them stick out, or move them in however much you like.