Yea, there could be a problem. Look closely at the exhaust crossover. The '72 and up heads have a big square cavernous opening and the early heads have two holes or a slot that is much smaller. The early intakes don't have enough metal to cover up the big hole. The ports will line up fine and it will bolt on but you will have a huge exhaust leak. The '72 and up heads also have A.I.R. injection passages in them that are also covered by the big ugly rails cast in the side of the later intakes. These would also leak exhaust gases if not plugged. I would be curious to find out if anyone on this site knows if the early Edelbrock B4B aluminum intake will fit all years of stock heads or if it is a '67 to '70 or '71 item only.
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