Unusual T/A

I have a pair of 16 firebird wheels and need to know what size will work best. 26x11.5x16 or 26x10.5x16? Both are et streets! Umm mods to the car are,
Car is a 2002 Ws6 6spd
Mac headers
True Duals
Lid
Asp Pulley
Comp Cam 222/226
G2 LCA
Spec Stage 3
Custom 8.8 Rear End with 3.73 Gears
Relocation Brackets
Ported Tb
Car made 402/378 about 4 weeks ago. I want to get around 1.6 60fts or better

Thanks

Smitty

Go with the 11.5s,no fitment problems.