I have always ran a 1050 on all small blocks.
Its a short clip, but in the first portion of this video you'see the truck running on gas using a 1050,
As you will see from the exhaust, its not running rich at all, no black puff of smoke
http://www.racingjunk.com/video_gallery/60574
You shoud not have a problem at all.
This was a flat top 350, good set of heads w/ lots of work and a 5 something lift cam, 2" exhaust. It wasn't much. With the little 142 blower it ran 10.10's. Without the blower it ran 10.70's