That's looking like a pan seal to me, but hard to tell from the pics. I've seen the rubber seals grow/squirm out, I never use them, my personal preference is the cork ones. I use the cork side rail gaskets too.
Think I mentioned before, I don't use OE type pans anymore, but it could be a pan problem. the rear portion could be stamped wrong.
Won't know for sure until the pan comes off. Bummer. I feel for ya!
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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