Hi Mark,
Is Twian a brand name or did you mean Taiwan? Either way... You have the
option of re-using your existing balljoints, or using these.
To restore the ride height of the car, you'll need a spacer that is equal to
half the height you want to raise the car - this is because the spring perch
is about halfway between the fulcrum pivot and the balljoint center on the
lower control arm. Alternatively, you can put rear axle spacers between the
rear leaf springs and the rear axle, but that tends to contribute to axle
hop ;) .
Adding spacers does not increase the spring rate, so it won't make the ride
any worse than it is.
In order to get the camber curve designed in by the people at Rootes, you
have to have the ride height (actually, the control arm angles) set to what
they intended. Fred Puhn's book "How to make your car handle" has an
illustrative example where the use of low-profile tires on a vintage Formula
car drastically changes the control arm angles, and results in a poor
roll-center location.
I currently have my front end completely disassembles, and I can take
measurements for you, but I'm pretty sure that the springs I have are at
least as non-stock as yours. The spacer diameter will be whatever the
diameter of the rubber insulator is - I can get that for you.
Best regards,
Theo
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