From what I see by the specs.......The 1405 manual is a hair richer on the primaries vs the 1406 electric...
http://www.edelbrock.com/automotive/mc/carburetors/performer.shtml
With that said, if you want a electric choke, I believe it can be added to the 1405? But why not just use the 1406 and get the tuning parts to get where you need to be...
Or buy a Holley...lol. Just kidding :D.
