A drag mod is not for heat racing as its not going to get the best fuel milage. The timing profiles on this engine are very aggressive.... it makes alot of power that way... Too much power for racing on a dirt track thats for sure. For heat racing I would suggest a good .21 such as the VZB you mentioned and throw one of my stage 2 mods on it. That way you geta nice performance increase to have that edge over the competition and keep your fuel milage while doing so.
The 2060 pipe is a great match for the Vspec. It gets good milage and makes a nice smooth powerband.