As of now,the only decent/functional 350 headgasket choices are the Cometics,and the Innovative Seal (formerly ROL IIRC).
There have been some discussion about that in the street forum not too long ago,a search should bring up those threads.
All the other headgaskets are made for the larger bore engines,and thus have too much "dead space" around the top of the bores.
One of the main reasons some of us are looking at the 350 for a boost appl. is because the smaller bores should allow for slightly more headgasket material between the bores which hopefully may add some % of strength to a known weak spot in the larger bore applications,this would be especially important with regards to the center cylinders with the siamesed exhaust ports (3-5 & 4-6) as that's where pontiac headgaskets are most likely to fail.
HTH
Bret P.
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