While installing rear shocks on my 71 yesterday, I happened to look up and noticed that all of the neoprene fuel hoses above the rear end housing were crumbling and cracked. The hoses at the fuel tank were deteriorated badly as well. Anyone who has completed a frame off should have already replaced these hoses. If you've recently purchased your car, or if like myself, purchased it with the intention of starting a frame off later, you need to crawl under your car and inspect these hoses ASAP. Like I said, they are above the rear end housing. One, of course, is the fuel supply line, and the rest are part of the vapor recovery system.