Tail panel depth

[mbolin05]

70 barracuda tail panel...here is a video of it clamped in place. Should it set flush with the rear quarter or be set in some as in the video?

I have a 73 parts car and the tail panel on it is flush at the top and the bottom is set in about a half an inch.
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[70chall440]

I know its not much but I am pretty sure it is inset a little bit.