Cobra swerves when backing off the throttle!!

[RICK LAKE]

commercialcobb.What have you done to the car? Built it, brought it new assemblied, brought it used? I am trying to get get a base to work with. To start with are you runnning a complete iron 429-460 motor in the car?
Have you started at the front of the car and check and tighten every nut and bolt?
Do you have the correct tire pressures in all 4 tires?
Have you measured the ride height in all 4 corners and is it level with your weight in the drivers seat?, If not you need to adjust it.
What shocks and spring rate are on the front springs?
Are the motor mounts tight and not split where it goes to the frame?
Any chance you have an alignment sheet of specs for the car?
Any change of a short video of this happening? can you get it here on the forum? this would be a big help in seeing what happening.
If you have a dirt track friend in the area, see if he will let you weight the car in 4 corners to start. Make sure your body weight is in the drivers seat. After this, go and align the car, About +1/2 degree of camber each side, +3.0 degres of caster l/s. +3.3-3.4 on the r/s. toe in the car about 1/16" and road test it. See if the car is still all over the place. If not you are good to go.
If you still have a problem I would be looking at the front shocks and spring rates. Both are too soft of the car. If that motor is all iron, thats about 700 lbs. You could have the wrong setup in the front end or the shock valving could be broken. Springs being too soft will also cause this problem.
Let's start at the top of the list and get the basics done first. Check for arms for play when you check for the bolts and nuts to be tight. Check the wheel bearings, ball joints, and bushings for play. If you find some repair and recheck. Tierod end play for none and play in the steering rack or dead spot on center. You would feel a small knocking noise through the steering wheel. The picture you showed us, is the suspension under load? IMO there is not enought clearance between the spring coils for them to work correctly and cause the car handling to be all over the place with coil bind. You should have about 4" of travel from loaded to unloaded in each corner. I am getting ahead of myself. Let's look at the beginning and go from there. Rick L.