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You could try adding some preload in the left front, and right rear. The fact that the springs have been dearched may be contributing to the problem. SS type springs have been working very well for many years on cars that run faster, so thinking this through a bit should unearth the problem. Maybe try a borrowed set of springs?

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Thanks everyone.

How would I go about adding preload?

The SS springs I have seen really jack up the rear of the car. This car sits nice and level and I would prefer to keep it that way, that's why I was considering the caltracs.

What about tethering the front suspension?

Everything is welded in. Probably the MP sub frame connectors. They were there when I got the car.

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Are your current leaf springs clamped on all leafs on the front and one or two on the back? If not try clamping the springs on the front half and using one clamp on the back half, move the rear clamps around to different positions to help balance (level)the twist on the front I have done that on a leaf spring car, works good, last a long time. be patient and do one change at a time and write the changes down. My 440 powered Dart with SS springs(002/003) moved into the frame rails like the right rear clamp up real close to the rear end and the left rear back about two spring ends from the rear end housing you can also stiffen up the left front shock and run a real loose or drilled shock on the right front to help level the front end up on the hit at the starting line

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On the clamps with stock springs I would use more on the passenger side front segment. That will give you some Launch load on that end to help you leave straight.

I run a 1.43 60 ft 10.47 et with stock springs and leave straight as can be, so im sure you can do the same. It will take some test and tune with the clamps and some front shock settings as stated by Cab. mike

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72 Dart with frame connectors and roll bar. Runs 12.0s in the heat of summer with 1.66 60 foot times.

This new motor makes more torque and we also put a low gear set in the trans.

It lifts the left front tire about 6 inches.

I'm looking to keep the car level at launch. The twisting seems like wasted motion, and it's probably not good for the car to twist that much.

Car has all stock suspension with a pinion snubber,regular shocks out back and Summit 3 way adjustable shocks up front. The rear leaf springs have been moved in to the frame rails and the springs have been de-arched (don't know why, it was that way when I got it.)

I'm thinking Caltracs and maybe the mono leafs would help but wanted to seek opinions from those who may have had similar problems.

Thanks

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I would strongly suggest you contact Mike Roth @ MR2 Performance in Lebanon, Indiana. He is the expert when it comes to suspension problems and remidies. Most of the time it takes more than changing one area as every component has to work in harmony to get the car to launch properly. He does a lot of work on the SS/AH cars, B bodys, etc. and really knows his stuff.