Sullivan Tank w/Aircore Colt 40
Personally, I hate the amount of work required with those tanks, but with the Aircore, you don't have any choice since it's the only tank that fits.
Here are some tips that might make things easier:
1. Don't worry about getting the vent tubing exactly up in the bubble. Just get it near the top of the tank, and out of the way of the clunk. Cut it at an angle so it can't get closed off by the top of the tank.
2. Throw away the tiny little wires. They're meant to be clamps for the tubing, but they'll just cut through the fuel tubing. If you're nervous about the tubing coming off the fittings, use little nylon zip ties.
3. You don't have to tighten the screw in the middle of the stopper very tight. Just snug it up. There's not much pressure inside the tank, so the stopper is not likely to leak.