1300rwhp
But why not just use a 16 injector intake. Run on pump gas full time and than when you hit the throttle the other 8 injectors automatically start spraying race gas from a stand alone tank to a 75/25 mix of race/pump gas at a preselected boost/power level. All on the fly.
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Just hope that second pump doesn't fail...........
Your size question will relate to how far you need to go with fuel, less octane needs more cubes in general. If you can use good fuel, a nice 427 with a pair of GT42's will get it done easily.
Kurt








