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Hi Linda. You're doing the right thing. A 3.36 gear is perfect for your '67. It was the standard ratio for automatic trans GTO's in '67. Good power, good acceleration, decent fuel mileage/cruising at highway speeds. A 3.36 is as "long'legged" as you can go with your 4-series carrier. I know. I did the same change. I was able to locate a set of original, used gears for mine. The ring and pinion on these cars almost never wore out, so you should be able to find a matched set of good used gears. I would NOT go 3.55 with your car......with the automatic, you'll be sucking fuel and revving high at freeway speeds. Good luck, and if I come across any 3.36 gearsets, I'll let you know asap.
Jeff
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