According to Barry R who used to work for Federal Mogul, the Printoseals were not designed for long term use. They are for racers who pull their intakes off pretty frequently. They are nice and soft and easy to cut to fit ported intake ports. A lot of guys on the FE Forum like the Victor Nitorseal gaskets you can get from NAPA:
http://www.network54.com/Forum/74182...rmance+Gaskets
The Nitroseals have a metal core so they are hard to trim. Their composite gasket looks similar to the Printoseal but the material seems firmer.
A lot of guys also use the Mr Gasket intake gaskets. I'm using a set of those. They seal well and are easy to trim to fit.