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A good transmission tune is all you need. 6l80s hold up good at higher rpm and power if the tune is spot on.
I say weight reduction because the convertible cars are heavy! 550 rwhp on a 4200 plus lb car will probably not get you 10s, I think it would be close but no cigar.
A good cam/head setup on aggressive boost will get you there with a great lightweight wheel/tire combo.
Nitroman28 has cam/head 10 psi setup in a hardtop car that will run 10.50-60 if I had to guess off his 1/8th times. That power level will get you high 10s with the heavier car.
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