the holley blower with a carb is simple... because it's a draw though... you dont have to seal the carb etc.. BUT, I know someone that broke their crank... trying to run more boost... with the B&M blower...sooo....
http://www.waynewestlake.com/trent/kurtboom.htm
the cool thing with the 347 is that you dont have to TELL anyone what it is...
you'll need to by some extra stuff if you go 351... new intake.. headers.. etc...