Do you have a vice at home? I re-arched my springs in the garage (thanks sportsroof for the inspiration), i think i have some pics if you need. Basically take 3 long bolts, put 2 (vertically) on one side , close to the left edge and the right edge, hold in place with duct tape. on the other side of the vice, put a bolt in the middle, vertically, hold in place with duct tape. This way when you pass something through and compress, it will bend the middle. Sorry for the bad description, looking top down it should look like this:
The vertical lines are the bolt positions, the horizontal dash lines is the leaf spring (ignore the dots, i had to put them in to keep the spacing correct) :
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Then you just pass through about an inch at a time, squeeze vice so there's a bit of pressure where you can see the leaf straighten a bit (will need an extension on the vice handle to help with leverage). and just move along about an inch at a time - compress, release, move, compress, release move. It's best to go over it 2 or 3 times , so that you apply a gentle curve rather than trying to get the shape in 1 go. It will also help as you're reshaping on many points after each pass i.e. say you mark 1" increments and have that mark line up with the bolt on the first pass, on the second pass have the bolt between the 2 marks, so that you're applying as much even shaping as possible. It took me an evening to do each side, but i have 5 leafs per side, so you should be able to do both in an evening. Keep the other side nearby so that you have a reference point to know how far to go. I think the ratio is 2:1... i made it 1.5" lower compared to the reference one, matched the second to the first to make sure they were even, put on the car and it was about 3 to 3.5" lower. I was aiming for a drop of 2 to 2.5" as you could almost put a coffee mug between the tyre and the arch, but i'm not too happy that it's this low as the top of the tyre sits exactly inline with the arch, would have liked a little gap. Anyway, that parts up to you but the main point is that if you're looking to drop by about 2", change the arch to be about 1" lower.
Hope that helps!
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. Standard dimension across various sources would suggest it should be 25" - that would easily look better but I want to go lower than that............ it currently has a monoleaf spring which I know is wrong for a 69 Camaro 350. I know I can fit lowered leaf springs (plus a fitting kit maybe?) ............. SO, just looking to find out what anyone else has fitted and how low you have gone please? 
