For the longest time I had been considering going with a fuel cell, but decided against it after researching that product and am planning on using it with a reconditioned stock tank when I get to that part of the build. We only have crappy 91 octane for our premium gas here in California and a reasonable amount of E85 stations so my plans are to tune the Haltech for both and use a sensor. E85 is over a dollar cheaper than 91 octane and if I'm not mistaken = 105 octane. As far as the Holley Hydromat goes they said their 450lph kit supports up to 875 hp EFI at the crank and ?? on E85.
The Aeromotive Phantom flex 450lph supports 800 hp EFI at the crank and 550 hp on E85.
It was suggested by Aeromotive to run dual 340 lph pumps to achieve my 500 whp + goals and would accommodate 900 hp+ on E85.
A short discussion was started briefly discussing this found here:
Nelsonian, San Diego, CA.