The '69 L88 and ZL1 carb was an 850 DP. The R-4296 that is listed in the blueprint specs is described by Holley service manuals as a DP and if you have ever seen a restoration you know that it is. The '67 and '68 L88 engines (R-3418 and R-4555 Holleys) were 850 vacuum secondary carbs.
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