Your best bet is if you can locate a used lightning drivetrain and swap it into your expy. The lightning motor is very docile and drivable if you are light on the throttle yet if you put your foot into it, it will make its presence known. There are a few making over 500 rwhp with the eaton blower that comes on the lightning. The eaton blowers are known for making monster torque numbers as well and this will be great for pulling and breaking parts.lol. If you swap to one of the many aftermarket blowers the sky is the limit. There are many routes you can take once you have a built lightning motor. Check out http://www.lightningrodder.com/ if you are considering a lightning swap.