[jmcarter]

In S/ST you're allowed to add up to 500 pounds but there are several legal requirements to be met (NHRA Rulebook General Regs 4.2) so you're going to have questions that downloading a rulebook will help you with. In general you want to add weight fairly close to the centerline of the car (corner weighting to achieve correct balance recommended) and also toward the rear as a traction aid. 10.90 in IHRA only requires 2600 weight min. so might be good place for you to start...