Well, I know that this is grudge racing and once the smack talking starts you are on your own

. However, I would start like this. One formula for average rwhp is 197 * weight going down track / et^3. Your sig says your best et is 11.74 and I'm going to guess a total weight with you at 3600 lbs, so use those to estimate an average rwhp (if you have better numbers, use them instead): rwhp=197 * 3600 / (11.74*11.74*11.74) = 438 rwhp. Now use that hp and subtract 1000 lbs and calculate a predicted et for your car at the new weight: et=cube root of (197 * 2600 / 438) = 10.53. So, if your car were 1000 lbs lighter your et would drop from 11.74 to 10.53, in theory. This ignores all kinds of things like gearing, 60', wind resistance, etc, but it is a place to start. So, if you are doing this as a grudge race at a track and they will set up the tree, give yourself a 1.2 sec head start to compensate for the weight difference. If this is going to be, um, less formal

-)), then (I'm skipping more boring math) a rough estimate is to give yourself a 210 foot head start. Regals are 17' long so that's about 12 car lengths. That puts you on equal footing for weight, so now it comes down to hp and traction and driving. Be safe and good luck.