Well lets get into the time machine, and go back to when it was built;
in 1966 Edelbrock had not yet made the LD4B,
so if you had a 273 small block engine, and wanted to put a larger carb on it
you had few choices,LOL.
Actually those manifolds are good to 6,000 rpm, the low range is where
a single plan is not as good as dual plane. ;)
http://www.autohobbydigest.com/ddart.html
