I bought a JAZ Jr. dragster fuel tank that looks for all the world like an overflow tank for the radiator to use as my supplemental fuel source. I mounted it where the horns were on the core support. It has a small 5psi electric pump under it that will carry high octane fuel to the fuel solenoid. Again, not completely hidden but unless you know what you are looking at..

The great thing about all of this is I have used almost all existing holes to mount everything.

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'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.