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only four are needed right? Links on the others?
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NO links on the others, unless you have a reason to want to short A0-A7 to 0V. Just fit the ones on A8-A11 and only if you are NOT intending to try the buffers as it's either / or. (Buffers + mod to the buffer enable circuit, OR direct connection without buffers and 4 x capacitors on A8-A11)
If you are not going to use the buffers you need to link across each of the 6 gates in each buffer to connect the system address bus directly to the PIC pins as they were in the original prototypes. If you have fitted turned pin sockets for the buffers you can just plug little hoops of solid core wire into the sockets.