I am looking at purchasing a drop center link for my 67 from Howe http://www.howeracing.com/Steering/Index-Steering-Centerlinks.htm
I noticed that they don't have 67 links available. Does anyone know the dimensional differences between a 67 and 68 center link? Or may someone knows where I can get a drop center link for a 67.

I don't know what you mean by a "drop center link", but a stock style is available here- www.southwestspeed.com
Part# 107-226 Phone 479-646-6988
A '68's front track width is 1" wider than a '67 and the size of the studs and holes in the center link is different between the two years. '64~'67 are the same, '68~'72 are different, they will NOT interchange.
BillL