I found out (in the meanwhile) this should be 7.125°= 1.5" pre 12"
7° may work though
special equipment is needed to measure this angle precisely (not only micrometer)
its for a 66 mustang with the origional power stearing it requires
a specific bent tierod end it is granada ,speedway motors sells the
taper .the problem is the tie rod end is larger than even the 70 tie
rod end so the spindle arm must be re sized, the outer will work
on 67-70 with resizing