Not sure of any drag's in Dallas, but there are some in Fort Worth area- actually Burleson on the 15th of next month. I usually race there on a regular bassis- should be there, but bike less.
The mods are never ending, check the Drag Forum for lots and lots of information. If you going full drag there are some things I consider a must for a drag bike- make it as light as possible, lower it and strut it, drag pipes help, override tranny....list goes on and on my friend. To go fast it costs money...how fast u wanna go?