on a few of the sending units I've modified, I've used the vapor line for the return. I'm pretty sure first gen's don't have one. You can modify the filler tube in a similar fashion to how some oil pans are modified for an oil return line. Take a center punch and puncture a hole in the filler neck. Keep pounding it in a little more till you've opened it up enough to fit an 1/8 pipe tap in. Tap the sheetmetal tube for the pipe fitting and install a hose barb. Now slip your retuen hose over the barb. Or you could install a pipe to flare adapter and run steel line all the way(preffered method) This sounds pretty crude, but it works and saves you from welding on the tank. If you're planning on putting a sump in the tank and will be welding, then I'd put a fitting on top of the tank and call it a day.
Another note on the dist.; Be sure to lock out the advance mech. on the dist when you go to the computer controlled ign. I usually put a small weld on the plate to keep it from moving. You can then eliminate the weights,springs, and vac advance.
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