I've posted elsewhere, but I fitted Calverts mono-leaf springs (thru Will) and the car is 2" higher than the original saggy springs allowed, it has also stiffened up the car and made it more enjoyable to drive.
David, this pic shows my stock mono leafs on the Dart. the gap between the top of the tyres and wheel lip wasn't there with the stock knackered springs. Stock height monos, 60 profile tyres.