[cs69er]

I have recently obtained another person's headache in the form of an unfinished classic cobra. the seller said the engine was a 429 of unknown year. I have been unable to locate the engine serial number in the typical location which makes me start to question what I have. Here all the numbers and locations to help all of you engine knowledgeable folks. The rear of the engine block has the number 352 and 14 under the top number. The intake manifold has a large S with C7AE and 9426-E underneath the top number. The heads have the following number C6AL J. On the front left side of the engine under the dip stick is the following number 17D1F. The casting number on the front right side of the engine is extremely hard to read but it appears to be 3M5 and an unreadable last digit or 3W5 and unreadable last digit. That's it scouts. No number on the right rear near the starter. Any ideas what this animal is? The choices seem to be: 390, 427, 429. I look forward to all ideas guys. Thanks, Chuck