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My MFI pump (1971) only has one solenoid: the over-run cutoff.

I think the earlier cars (69-70) have a cold-start solenoid. I know they have two on the pump.

I would stick a little drill bit in the hole in the brass tube to get the size.

You would have to have the stacks OFF before drilling any holes, I would think. Don't want shavings down the holes.

Also, I wonder whether putting anything into the brass velocity stacks could mess up the flow. I would consider fabricating a clip that attaches to the lip of the stack, with a nozzle on that, but it would have to be pretty secure to avoid being sucked in.

Good luck and let us know what you decide and how it works.