I am going to take a stab in the dark
Rate that seems to work well on 1st gen Camaro at about the weight as your car. 550 lbs springs on front and 300 lbs in the back. Front bar sizing is 425 to 475 lbs @ 5 degrees of twist.
Whomever is bending the bar for you should be able to size it based on that and how long your end links are going to be.
I have no idea what the rate of the rear bar should be or what your present rate is now.
Would be eaiser and way cheaper to get a bar from Speedway Engineering and have custom arms made. You could mount the bar high or low in the car. Bars are not that expensive (think around $100 off the shelf sizes and $200 custom) and would be easy to change to fine tune.
Couple of different theories out there. Some like lighter springs and big bars and others like stiff springs and light bars.
I am sure someone can calculate the correct rate, but I do not have that modeling program.
Good luck
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