With all of that said I would recommend sticking with your leaf springs. If this is a street/sometimes(maybe) track car there is nothing out there that will outperform the leafs on the street AND give a decent showing on the track with some tuning.
I was doing the same dance you are when I was bubbling up my Astro van project. I talked to a LOT of people before I decided to stay with leaf springs. The ONLY thing leaf springs have going against them is; they are not high tech. Mundane and Simple work very well though and there is a lot to be said for simple. Like "cheap", "no maintanence", "easy to tune" and "not a major tearup to install". Unless of course there is some narrowing involved...
Mark
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"Bad Ast" Astro Van Pro-Touring Project.... Heat, beat, file to fit, paint to match...
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