Have you thought about a T in the existing port so you could run two sensors?
What EFI are you installing? I’m very much interested in EFI for my 58, 235 and would like to follow along with your install.
I have, I don’t think there will be enough space with the 2 sensor bulbs in a T configuration.
I’m looking at a Holley Sniper. They have a 1.45” bore 1 barrel set up.