Hilborn offer a gasoline EFI street system but at over US$5,000. Bob Bendsten, www.transmissionadapters.com, modifies Cadillac North Star systems to fit the Hemi but I have no idea of price.
The Holley, or a big Quadrajet pass enough air and fuel to adequately feed these big mothers and nothing to go wrong.
I had a Mopar Performance drag race spec Hemi 426 in my Challenger. While Chrysler may call them a "Street Hemi", they are really a thinly disguised race engine. Not happy at low revs in traffic and very lumpy under 1,500. Mine was putting out over 600 horses and would happily run up to 6,500rpm. Sound at 6,000 under load was really something.

