I wanna drag race----help

Outsider said

If you are going to run sticky tires, get ready to throw alot of money at that 4-speed. Chances are you don't have an 18 spline, and a 23 spline will not hold up in a drag car. They are tough, but not that tough.
If you don't intend to run the car on the street, you can sell your gearset, and fill the case with Liberty gears.

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I do want to run this car on the street as well. I checked the trans input shaft and its a 23 spline. An automatic is looking better and better all the time. How much HP do you think the 23 spline is good for? If I do go with an auto (727) how hard are they to find for an A body, how much will have to be done to it, how much $$$$ is it going to add to my low budget race car project for a unit that will stand up to the abuse of an inexperienced drag racer? ..... These and more questions to come.....
Kev