Interesting. I can fill all of my '68's full bore with no worry of fuel burp. Now my Durango, that's a frustrating job of getting gas. I've seen gas spray three feet horizontally out of that baby! At $4 per gallon, drives me crazy. Not sure why we are all having different experiences though. My red 'vert still has her original tank. My other 'birds all have new tanks. My '67 also filled without any issues.
On that Durango o f yours, there is a TSB regarding difficulty filling the fuel tank. Here's the no. 14-001-09, let me know if you want me to email you a copy.