I agree, either Painkiller or Miracle Man would be your best place to start. The Painkiller gives you a very tight, percussive and dry sound that makes all the fast riffing very in-your-face. I almost think of the the PK as a "Marshall in a pickup" - it has that British upper-mid focussed voicing. Definitely the right pickup for the Gama Bomb sound.
The Miracle Man is more saturated and compressed but still very tight, it's fatter in the low mids (which could work very well in conjunction with a Marshall). It is bigger and "chuggier" sounding than the Painkiller, closer to Machine Head as DimeZakk has mentioned.