Bonneville Landspeed Racing - Let's Try a Thing.

So I have been thinking this AM. I am going to finish the car and run in the 150 club in Sept. Then, for 2026, convert the car to a Daytona leaving as much else alone as I can. See what the car picks up for speed with aero alone.
A friend pointed out if I run in the 150 club but the car is faster I will never know and can't have a direct comparison in speed. So, I will need to research open/timed and how they figure speed vs safety equipment