alcohol....

As Carl already said, anything rated for ethanol/methanol will do well in E85, its simply ethanol with 15% or so gasoline added. Bumps the BTU rating up, and drops the volume consumed a little....

Also, with the gasoline, the "top-lube" is already in the system, where alcohol not only absorbs water, it washes oil and drys teflon and rubber seals... sooo you get a little lower maint headache with an E85 system.

There is still some, now if running E85 on a daily driver, drive like a regular gasoline car, start, park no big deal. But with a race car/truck etc with prolonged storage, you don't want stagnant E85 sitting in the system, sooo there is a storage requirement to flush the thing with gas and store wet with gas.

As for pumps, for 500hp on E85 a 240gph free flow pump should suffice, #10 primary feed is fine, sump to pump, and pump to regulator. From regulator to carb, #8. Most pumps in this market have a built in bypass and you can dead head the pressure regulator, but a full return system tends to work better longer, the regulator deals with fewer pressure spikes.

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Use something in design similar to the SS program. Replace the #8 with #10, and replace the #6 with #8, use a bypass regulator, and a 240 gallon per hour free flow pump of choice.. and viola.