[Dragsinger]

LS Racer,

In my opinion, your first step is to forget about the street legal deal.

*Do everything reasonable to remove weight, doing so will help the car in every way.
*Remove the 400 trans and install a powerglide with properly matched 8" converter. The powerglide will be a superior package especially as you remove weight.
*keep a close eye on the tires and consider the tire options. About 200 runs is the reasonable upper limit, maybe less.
*keep good records and experiment, experiment, experiment.
*have fun