I notice you stated you have the original 260 engine.
I’m conducting an Original Tiger Engine Study with respect to the Ford Casting numbers and Date codes. I hope you would be willing to assist me with the numbers on your original 260.
I can send you an email with the list of numbers I’m studying.
The 5 bolt 289 should be straight forward you with just need to use the Tiger specific 260 engine parts on the 289 block.