My source says 204 as well. It is for the rochester quad 325-350hp with auto

Here is the book I checked:

http://www.rickscamaros.com/product....dept%5Fid=3476

 

www.chevymania.com/partsid/carb.cfm?make=Rochester&model=4-brl www.camaros.net/forums/showthread.php?t=27395&highlight=7028218
TAG...you're it!! We could do this all day.
Has anybody else been noticing as I have, that the reference materials and enthusiast websites that are supposed to be the authority on info are saying that the 7029200 is the right one, whereas the references listed that are ones that SELL the carbs are saying the 7029204 is the right one? I find that a little interesting.

 

Touche. Too bad GM never kept any stuff. I agree - there is alot of differing info out there.
I like the link you put up from the manufacturer. I would be inclined to think they are the aproving authority in this case.