That setup looks very similar to a Guldstrand C3 5 link conversion. Using non splined half shafts. Notice he (Guldstrand) moved the link mounts behind the wheel centerline. Shorter the link the more wheelbase change you will have during suspension movement.
http://www.guldstrand.com/scripts/pr...p?idproduct=80
The forward links I think you will never get the length shown.
Now looking at it more the forward links are mounted well in front of the half shafts, that will shorten the forward links even more. I think you will struggle to get 14" from your wheel center forward. Just guessing, your wheel well goes forward next to the seats. betting again from seat back to center of wheels is maybe 13" at most. Look at a C4 Corvette setup also.