Afternoon Delight should be the name of this coffin-ish tank which is for sale! Killer old paint job on it that's in decent shape. I only wiped it down and it should clean up even better.
It's vented like some of the old sporty tanks. It might not have ever even been run after it was painted judging by the two petcock plugs in the bottom that are still in there. The inside only has minimal surface rust. Mounts are hidden underneath and uses a T-bolt in the rear and a bung in the front, but could be carefully changed if you kept the welding to the tunnel/bottom.
11 hours ago