Would an AFCO type adjuster work for you? Then you can use a real spring and a good adjustable shock and still do some tweaking to the height and for proper corner weighting. I haven't heard good things about coilover conversions on 1st gens mainly due to the small springs used like Frank says. I'm running Hotchkis BBC springs in my bird with Koni's and I love them so far.
Maybe you should look at the solid bushings, I'm running GW's with their subframe connectors welded in, and there is zero squeaks or other noise...just a nice solid feel. Solid bushings allow the suspension to do it's job, rather than letting the entire subframe move in relation.
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1969 Firebird, Black w/Parchment Arizen interior, 383 Pontiac Stroker (350/428 crank), TKO600, Moser 12 bolt, 18" TTII's, Hotchkis, GW, DSE, Speed Tech, Vintage A/C, etc.
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