Mike,
With EFI, more air is good. You can't overcarburate with throttle bodies. There are only two potential issues with dual TBs on a big HEMI. 1) The expense of the second TB. 2) Throttle tip-in is more aggressive. Most people actually like this but it can be a problem with a radical HEMI in a light car.

Just FYI: You block off the IAC on one of the TBs and keep the second TPS as a backup.