Hi Jim, If you use a 15W-40 engine oil and Rotella-T is a good one, you will not need to add any ZDDP to it. The -40 series oils have sufficient amount of ZDDP in it to protect these old engines. Some of the guys on here who are really great mechanics can correct me if I am wrong. They can also tell you how to go about taking that pan off safely and perhaps cleanly!
Yes, these old Tbirds really do draw a lot of attention. Younger people have no clue what you are driving. Older ones will tell you they used to have one just like it and then ask you what year it is!
Even though the license plate frame says it is a '58 or a '59 or a '60 or whatever it is! Enjoy it to the hilt!