I run Taylor 8mm and NGK tr55's I can't remember the gap on those though. I did notice a slight increase. I'm not much help on wether you can run a wider gap with the bigger wire, maybe someone else will chime in. The Taylor's are top notch product.
2004 GMC Seirra 1500: 3" Body lift, 295/75 Nitto Terra Grapler's on Stone Crushers, cam keys, Bilstein 5100, 5.3 liter, K&N 77, Stainless longtubes, Banks Monster Exhaust, Nelson Performance 93 tune, 2600 stall, Ls1 fans, Taylor wires, NGK tr55's, TransGo shift kit, Corvette servo, TCI pan, 4.10 G80 w/ TA Performance, Optima