Spring eye question

Killer6 said
What length did you tell them vs. what they sent? Stock? For a stock length, You do have the shackle upper mount forward a good bit(appears 1 or + inches)from the stock
position,this causes the rear eye to rotate up closer to the frame. It appears the eye is close to where a stk.(55")main would be flat w/no arch, but raised up in the body, the
shackles & eye can interfere w/the box and in your case the eye directly to the frame. You did a great looking job on your ride BTW, slightly longer shackles might give You
just enough if those leaves are almost flat there, and the car only increases in height about 45% of the amt. the rear eye drops.

I'll start with what I ordered which was rear springs for a '70 Dart. I also chose two of their options (1) spring pin moved rearward 1" which seems to be correct. (2) 2" lowered ride height. To determine overall spring length in my opinion would be determined by how they accomplish the lowered ride height.
They lower the ride height by flattening the spring pack some suppliers put a bend in the spring at the eye locations. As you mentioned a flattened out stock spring they will put the rear shackle angle at a very compromised angle and the side arm can hit the same spot mine does.The upper rear shackle position is not moved forward or up at all. The hole lines up with the hole in a stock bracket if it was mounted. If you look at the picture the shackle side arm is contacting the intersection point of the main frame rail and the frame support for the rear spring bracket. IF you were to move the top hole for the shackle the shackle side arm will just get tighter to the problem area because the spring eye isn't able to go anywhere other than towards the rear of the car. If you lowered the top hole it would give some clearance between the spring eye and the frame and slightly raise the ride height.
With the rear spring eye tight against the bottom of the frame rail what the real ride height is would only be known when (1) engine/trans are installed in car and (2) if the shackles were removed to let spring move more IF they would as now they are being held at the point they are in by the shackles. The car is at the ride height I was hoping for already so time will tell as to the actual ride height will be.