so....according to carbs unlimited a carb with the number 7041200 is for a 402 of 454 engine
http://www.carburetion.com/Number/oe...number=7041200
yet, a carb with the number 7041202 is for the 270hp 350...
http://www.carburetion.com/Number/oemnumber.asp
So, answering my own question, it apparently does matter. I will have to investigate further.