Butch,
It was late September 1930 when frames started to utilize the #6 body bracket. If the frame does not have the bracket, that simply means that more than likely another body style was set on that frame of yours.
There should be NO holes drilled for the bracket unless someone removed them...HOWEVER...you may see center punch marks for the brackets IF it is a frame past September 1930...If the marks are not there, then more than likely it is before they started to punch the frame for the #6 bracket.
Then again, you may simply have a frame that did not get center punched.
Pluck