I have no experience with these, but....
Trust in quality may be a concern with Pro Products. I would have thought that port size would be similar because of it being an Air Gap "copy". There still is a M-1 dual plane from Mopar for smaller ports than the Edelbrocks.
http://www.manciniracing.com/mopduelplanm.htmlMaybe to help make an educated choice, search to see if there are any dyno numbers using those intakes in LA applications. The HP/torque curve numbers should be similar to their Magnum counterparts.
Any concerns using an Air Gap style without heat crossover in the winter months?