Tank sealant Man I'm ready to do this, have dropped the tank again on my 68 Firebird w/Edelbrock EFI, which is starving on too many hills and turns. But I found that the hole is only about 1.75" dia. Too small to fit the Walbro pickup through right? So, I guess that means I have to cut open the tank. What's a good gas-proof sealant for sealing up the lid on the cutout and any other tips for doing things that way?