For most doomstuff i use a jvm410 profile from pete turley or sinmix's prs archon profiles. They're not the typical amps for doom but they both stay tight if you play faster passages here and there. More traditional choices would be sunns, orange rockerverb, or a marshall of some sort. As far as eq try bumping up the low end a bit and running some reverb/ slight fuzz for a more standard doom tone. Drop the fuzz and add more reverb/ hm2 pedal for more of a black metal tone.