Suggestions on venting fuel tank

The 69 is not the same. Different shape, and the early ones (the flange) go in INSIDE the trunk, where the flange on the later ones are outside. But you could pull that one and modify it. What "I guess" you'd have to do is braze/ silver solder something like a shortened 1/8X 1/4 NPT bushing into the filler, as flush as you can on the outside, shortened so the nozzle won't interfere on the inside. Keep that in mind when placing the fitting. This is because the tube comes in the side from the outside, a 69 style tube will not clear the flange

I have a 74. I have thought about brazing a tube in "flat" against the filler and then sawing a small notch in the quarter panel hole flange to allow passage, then bend the tube out slightly to get a hose fitted