guide pillar center distances

[dankel]

i have a large mold with a guide pillar cd of about 700mm, what should be the clearance between the guide pillar and bushes if the temp difference between core and cavity is 20 degree c. it is three plate mold for a1000gms ABS component with a uniform wall thickness of 3 mm.should i use taper interlocks and how do i maintain the center distance in them(interlocks)