4-links with track locators are great for traction...not so great for anything else. You are actually at an advantage however, with the rear suspension as it is there is no reason you couldn't simply add a PHB and replace the upper links with a single third link (obviously a new pair of brackets need to be made up). Do a search for Mean69 over at pro-touring and find one of his 3-link posts. I think I have a few pics, hang on....
Obviously this is an extreme example and I wouldn't expect this caliber of work out of most, but none the less gives you something to strive for.
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Dennis
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