[bishir]

People have reported this before and it turns out it's just the normal fuel pump noise.. Do you have a mechanical fuel pump? It might be worth the money for you to buy one of those auto stethascopes from autozone and listen for where the noise is coming. Just keep away from the exhaust with that thing on!

See my 69 convertible and the VMF parking lot at: http://www.geocities.com/Bishir1/FrontPage.html
http://www.jps.net/binay/webdocs/frontside_sig01.JPG