SLP, Zoom or McLeod(single disk) are all good street clutches that can handle 400HP and trips to the track. I'm not a big fan of spec, heard to many bad stories about their lower level units, and the only one I ever drove chattered something horrible.
The LT1 hydrolic clutch/flywheel does not have much extra meat on it for resurfacing, so if it does need to be cut you may be required to shim it. Another option is to just by a GM replacment or upgrade to the SLP light weight flywheel. The SLP FW is not cheap, but it is top quality.
I ran the SLP FW and McLeod button facing clutch for 50K with lots of track time. It was just started to slip when hot lapping when I pulled it.
JB
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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