You "could" run a this pump, or a similar mechanical dead-headed [non return style system]. They offer a boost reference fitting option. Imo, this would be marginal, as you would be at the edge of the pump's pressure capacity at 7 psi fp and 7 psi boost.
http://www.robbmcperformance.com/pro...chevy1100.html
Fwiw, I would buy more pump that you need, and do a return style system. A few seconds of detonation from running lean will destroy a supercharged engine quicker than it will a mild N/A'd deal.
Dave