Personally I like to call an all in with AJ+, Harrington advised being even tighter when I read his books I’ll need to find his rational again and share it. I will shove any 2 cards into one opponent 10BB deep, however I’ll normally need a decent ace to call. Like all things in poker this is situation dependent, although I feel calling with A3o in my opinion isn’t +EV.
To demonstrate even Ivey will sometimes fold AK pre-flop to a 4 bet his reasoning is villain’s range is QQ+ and against that range AK isn’t doing that great….
https://www.youtube.com/watch?v=bofHh-zBhvU&feature=youtu.be