I have an original unrestored all matching numbers ( except carburetor ) 1970 SS Chevelle 454-4speed, no rust, 29,000 orig miles Oshawa built car, with full docs including protecto-plate, under the seat build sheet, original GM microfilm, GM Canada docs etc.....This is an original non cowl,non stripe fathom blue car ( 75% orig paint ) only one of 57 built at Oshawa. I may enter the car as a survivor, except somewhere in it,s past a holley carb was installed and the original Rochester went missing. The car was built Jan. 26 1970. I have 2 carbs , both 7040205 carbs, one has a date code of 3409, and the other has a date code of 0070. Either carb could be used, but which one would be more correct, my guess is the Dec/69 carb, but 7th day of Jan/1970 could work as well since the car was built 19 days later, allowing for shipping from Rochester to Oshawa assembly. As a unique note, the door glass in this car is DCL glass ( Canadian glass ) with a date code of AA70 ( first week-first month-1970 )...When I see this, it looks like the 0070 carb is not far fetched...What does the forum think?