Fuel octane on hp 273charger engine 10.5:1 compression .

There is a convertable 1963 Dart down the street for sale , I am getting the itch after reading this thread and seeing the pics . HMM a convertible Dart with a screaming 273 , you got a sound bite ?
What are the problem areas to look at on this model ? List all the trouble spots , I'll go inspect he car tomorrow . Are the 60's lighter than the 70's Darts
My wife is going to kill me , but damn . I want screaming 273