carbed 3.8L out of an 87 NA regal

Did already. Well aware the N/a block is the same except the oil return. I assumed the 87 block was FI not carbbed so iam not sure what's in it
 
If it hasn't been swapped out for something else, it is going to be a 109. I have gotten 109's from an 87 na regal as well as an 86 g body pontiac. Just verify the numbers on the block. Counterman.
 
109 Block

I just pulled one from an '86 Cutlass last weekend. It was a carburetor model and a 109 block.
 
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