Bonneville Landspeed Racing - Let's Try a Thing.

Low is very important. Anything you can do to get the air to go around or over the car instead of under it will help.
I have been trying to think of a rubber type product that could be used as flexible skirting for wheel to wheel and front spoiler/splitter. Something that can also be removed for street duty. Lots of reading about rear spoilers, end plates, etc also.

Still not 100% on what to do for an engine, but the 383 will be in to get some break in time and maybe a first license.