The motor won't be under-cam'd with the 1-7/8" headers. I have only a little bigger of a cam (.607 lift) in my 511ci and I run 11.50's leaving soft (stock axle shafts) in my street car.

Btw, I have 1-7/8 hookers and 2-1/2" exhaust and ran the 11.54et w/3.55 gears.