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Here's picture of holes.    thanks

That makes sense , its from a 1968 z28.    it is original.   it also has holes drilled between the barrels on the top  ,  any info on this ??   ive had this packed away for many many years.  Could it been done to help with a problem ?  I tried adding a picture but it keeps saying file too large .     Im new to this website.  thanks for all the help.    

I got a 3923289 dz  list 4053 carb that is stamped 7B1  .   can anyone explain how this can be stamped with a date of 1967.  when dz was used in 69. ?    Thanks