How tall are your tires now and what RPM are you turning through the lights? Is it pulling strong all the way through, or does it start to lay down before the finish line? I agree with Vara on the windage tray, that can help you quite a bit especially in the upper RPM range. Once you get the slicks a looser converter will help too. If you search around Buick had a switch pitch convert for a while that could be rigged up with a manual switch for street or strip. Try a google search to see if anyone still sells them. That can give you best of both worlds for a street strip machine.

Once you have things running right, then concentrate on your driving and consistancy like Streets said. If you get where you can cut good lights every time, and run within .05 of your dial, every time, then you will be tough to beat no matter whether you are chasin' or they are. This all comes with getting to know your car, and that means not changing it every time you go out. Get it running right then leave it alone for a couple months and just work on consistancy. Learn what it does when the air cools off or warms up, when the clouds roll in or the sun shines bright. That seat time is worth a lot more than picking up a couple 10ths.

Pat