Joe, I have an all fiberglass hood on my cutlass and it uses stock hinges! Mine was made by Glasstek and I have had no problems with it. Bought it on ebay from seller Tamraz but here is a link to the same hood, and this guy also sells low torsion springs for the hood, though I do not have them and have had no issues.
http://cgi.ebay.com/ebaymotors/1971-...spagenameZWDVW
Good luck finding a steel lined ram air hood for the 71-72, I have looked and have found some aftermarket ones for the 70 but they wont fir the 71-72.