There are a couple ways you can go. The black bowl is a Berkeley G bowl, identifiable by the thick register at the suction flange. Compared to the B bowl, the G will build pressure faster on the initial hit because of the decreased volume in front of the vanes. Not a huge deal if you are not class racing. Both bowls can have a stuffer installed to further increase the hit.
The most performance gains will come from a well detailed impeller set up with proper clearances. Detailing the impeller will reduce cavitation which will translate into a hard launch as well as all around gains. After you have some performance numbers on your engine, then you can choose an impeller cut to match. Basically, you can add RPM by cutting it down from an A to a B etc., but you can't go back the other way.
Adding an inducer will make a noticeable difference in your launch with a few MPH on the top end.
Adding more horsepower and/or a stainless impeller would necessitate upgrading to a 17-4 or AQ shaft to prevent twisting the splines. IMO, American Turbine makes the nicest shafts.
Detailing the bowl will further reduce cavitation and increase efficiency and thrust by reducing turbulence. A box stock Dominator bowl is roughly equivalent to the best detailed Berkeley bowl and can be detailed for even greater performance.
