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Ill start with 200-250 in the rear and Ill put 450's up front
For the dragstrip Im guessing I would adjust the adjustable shocks so it is soft up front and as stiff as possible in the rear/
I hope that works.
I had a friend building a 69' tube chassis Barracuda, beautiful car, anyways, Eibach was very helpful with picking out springs. They even let him try a few out until he found the correct spring to get the front end lift he wanted.