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That number reminds me of the one my buddy tried to use on his 85. I think he had an issue because of bolts not lining up with the holes. I think it was due to being a later intake off a Vette with aluminum heads. I can't remember.
my guess - the manifold might be a 87-92 IROC, T/A with cast iron
head and center bolt valve covers. the 10088015 part number is not an 85 corvette part number. here's a link - page 2 has some info on TPI intakes.
I believe what you've got is an F-body manifold that is actually cast 10066015 and it would be correct for applications '89 - '92 5.0 LB9 or the 5.7 L98. I believe the 6's and the 8's are confused quite regularly. The actual part # would have been 10066014 and the casting is generally + a digit in the ID procedure. Compare your casting to the digits in the "firing order" and you'll see the similarity. '87 & '88 F-body is different.
That's why I asked for the casting in your last post where you asked: