So after reading numerous postings, it seems the most popular size for the SSI factory wheels is 245/60sr14 . Am I right? I want the car to be as original as possible, and the tires to fill the wheel well. After eight years it's time to finally finish this project, my wife say's I procrastinate!!!!
Who Me???????

 

The reason for that is because that is the largest tire readily available in a 14" rim.

 

You'll have to make up your mind, as you appear to have three goals:
Most popular
Original
Filling the wheel well
Far as I know, that will give you 3 separate choices, even if you're intent on radials (which is certainly a good idea)