TTI Header and Steering Box
the less shims the better. when you raise the engine it effects the drivetrain angles and will effect the u-joints if you get too carried away. when i built my car i welded 1/4" plates to the engine mounts on the k-member and then did the same to the trans cross member. i had interference between my idler arm stud and the headers. i raised the entire engine and trans 1/4".