Flat Leafies

I'll go ahead an apologize for posting yet another leaf spring question, but I didn't really get the info I needed from the other threads, so here we go. I have a 74 Duster and the stock leafs would be good for a level but not necessarily for springs. I'm tired of the poor gal looking like she's always trying to lay an egg and I'm afraid of exhaust clearance problems now. I guess basically what I want is to raise the rear so there's a little bit of noticable rake and a tighter feel, but I don't know the best route; money's a constraint, as I'm funding the car with summer jobs and the occasional holiday gift. Thanks.