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Click on image for the lowdown. 
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| | | | Joined: Apr 2006 Posts: 506 Shop Shark | | Shop Shark Joined: Apr 2006 Posts: 506 | My guess is that the numbers are from the throttle body.
If so, then 788 should fit your 235 manifold. The other two are probably too small and won't fit your manifold.
-Tom
1950 Chevy 3100 w/ 1956 235
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