Go ahead and purchase 3 qts. - you'll use about 2.5. You'll know it's full when it starts to come out the top of the fill hole.
As for brand, I used Amsoil ATF in my old T-5 and GM Snycomesh in my Tremec.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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