Small Block Oil Pick Up Tube Question

You do realize that the pickup is not the bottleneck right?
The bottleneck is actually the limitations of the pump GPM and the ability of the pump drive gear and shaft.
You are working with hydraulics, so you could suck 500 gallons a minute through a 1/4 inch pipe as long as the pump GPM and the system driving the pump is up to it.
By adding another pickup you are doubling the volume the pump has to move before the oil gets to the pump gears and the engine gets oil pressure at all.

Sorry to sound like a killjoy, but the laws of physics are not changeable.