It's not a 1968!
 

Hi

I have a 1968 GT390 that was built recently. I'm having all sorts of issues with getting the steering set up, basically because despite what I have told two garages, they have both used the Ford 1968 settings data.
There is nothing 1968 about the running gear it is all bespoke. I now have settings from the manufacture.

Q:Any known garage local to me (Great Yarmouth) that can set up Camber/Caster and Toe?

Not sure anybody can help you with a shop recommendation, but I would repost your question over in the "Classics" section here regarding specific info for alignment settings.

I do these custom alignments often.
Look for -5 to 0 degrees camber, 3 degrees positive caster and .10 to .20 degrees toe-in.