Looks like 389 head and block to me, date code on head looks like 1964 for a 1965 389. Do you have a 75 or 76 or 77 or ? cast on the center exhaust ports?
The block is a 389 but I can't make out a date code. As long s it is 1964 or later it should have pushrod oiling and you wouldn't have to worry about hollow studs.
