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On the '67, the access is behind the speaker support, the only thing that might be in the way would be a cover panel on the side. Been so long since I've seen an early GT I don't recall.Fill point is on the right side behind the centre console. Not exactly user friendly in my opinion. Maybe easier for you to remove the console?
Actually the '67 GT should be the three-synchro gearbox. If so, pouring the oil into the gearshift "hole" would eventually get to the gears, but better to put it directly where it belongs.I know I just drained mine from properly full (changing seals while out of the car) and it was about 3/4 gallon which would be around the 6 pints claimed by Bentley. Pouring oil into the shifter hole will just result in 3/4 gallon of oil on the ground under the car because the shifter hole is just a hole in the end of a lever that goes into the tranmission about 12 inches forward from that point.
Filling thru the dipstick hole isn't that hard - you DO want to make sure the area around the hole is clean 1st so you don't introduce grit into the gears.