I wouldn't waste any serious time with the 326. All the work and money you will spend on it can be better invested in a motor that will have more currently available parts, and not require you to spend weeks looking for the right starter.
Now, if we were talking about an all-original 326 HO, I wouldn't be saying this. However, I have FIRST HAND experience of buying a 1964 Tempest with a 326, installing a new timing chain set, new cam and lifters, doing a complete valve job on the heads - including new guides, valves and springs and buying a new intake, carb and starter. The one and only time I drove the car was from my house to a junkyard where I got $65 for it, since I had the title. With no title, they would have turned me away.
