[Alex Evonosky]

Vic,
First thing you should do is call Cobra Restorers 770-427-0020 and order the drawings. I believe they have them on CD, but not sure. Although I have heard there are a few glitches with some of the numbers, there is a thread here which corrects that. Since I changed my design for what I wanted, I never ran into any issues. I only used the drawings for the frame deminsions.
There are absolutely toooo many deminsions to list and explain on an email.
If you like, I can send pics to you for a jig I made from pipe with the frame rails bolted down. A MUST in my opinion
The following are measurements but kinda hard for me to explain or you to decipher if we both aren't looking at the same picture.
Anyway,
Frame rails are made from 4" tubing. DOM
Total length of tubes are 8'- 1/4"
20" center to center for the width.
Each end has a 1/4" cap welded on which makes the final length 8'- 3/4" in length.
The first, third and fourth cross members are 4" also. Coped
The 2nd cross member is 3" Tubing coped to set at the bottom of the 4".
From the front (with the cap welded on) to the 1st cross member is 7- 1/8" CL
To the 2nd ( 3") is 3'- 7/8" CL
To the 3rd is 5'-3 3/16" CL
And the 4th is measured from the rear which is 1'-1 3/8" CL.
Again, before you start you should get the above mentioned drawings and study them for a day or so before beginning. With the price of steel these days, use the measure twice, cut once method.
Once you get your above drawings, all the above numbers will make sense.
Don't forget to build your jig first: make it is perfectly level both ways. Then be sure your frame is also perfect once you have it bolted down to the jig. You will find this very important once you start trying to measure the difference between 1 or 2 degrees when setting up your front and rear suspension.

Hope this helps