LSx Valiant Build. Take a look inside...

You could do an external fuel accumulator. That's what I did. Runs well down to an empty tank.

I like to keep 4-10 gallons in the tank for road racing though. I ran lean after a long sweeper going on to the straight with maybe 2-3 gallons in the tank. Pulled foot out, turned wheel straight, gtg in about 2 seconds.

My accumulator is a 1 quart fuel filter.

Topbrent made this diagram of my system: