this might be a different issue, but i figure it cant hurt to chime in...
usually the problem i see on older gm C and H bodies is the section of exhaust just in front of and around the gas tank seems to hang unusually low, and there is a big gap between it and the body. even holding up the tailpipe as far as you can, there is still a big gap. if you have this issue the best way to fix it is heating a section of the exhaust ahead of that area with a torch until it is cherry red, then bending the exhaust up to where you want it to be.
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