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I have C5AE-F heads on my sideoiler. It has the intake and exhaust port sizes like the Cobrajet or low riser. I have a book"How to rebuild your BIG-BLOCK FORD" by Steve Christ and it does not have the C5AE P or F listed. It does have C5AE A and E for the 65 427 top-oiler and the C5AE D, B and H for the 65,66 427 Side-oiler. My block is a C5AE-H. I hope someone who knows Ford casting numbers jumps in here because these casting numbers seem to be all over the place. From what I've heard 427, 428 cylinder heads are worth quite a lot of money. If the heads are undamaged you may have hit gold. Plus a good side-oiler block is worth a lot. I'd try to keep the engine as close to original and you may have found a goldmine! Good luck.
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