Looks like it's been exposed to water, when you go to remove the jets the threads in the casting will come out with the jets, that is if they come out at all.
You could get some small parts that were salvageable, but I'd guess that carb will never sit on top of a running engine again. The castings do not do well when the float bowls get water in them.
I agree, probably a chevy carb, 75-79 era.
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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