I assume blue interior?
I would put the lighter color high,does`nt show dust as easy,won`t show scratches as easy either. Also will be slightly cooler in sun.
Of the cars I`ve done darker bottom/lighter top always looks good.

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70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!