I have hedman 79250 on my truck as well, they work and fit. I had to ceramic accel spark plug them BUT I pack my engine bay full of insulation to keep the mud out, there are some heat issues.

Blown Hemi - is yours a 4wd? I need bigger headers on mine, the only option I have found is the mad dog fenderwells. I always hear rumors of certain B body ones fitting but have never seen it.