And now to business.
Strange that anybody would put a dual plane on a 427 stroker. It sounds likely that it's a bottleneck, if so, going with single plane will of course help. If your heads are the bottleneck, you'll not see much difference obviously. But it's a cheap test.
Two carbs are IMHO more show than go. Yes, they can be made to idle fine. I had a tunnelram on a Camaro in the 80s, mostly because everybody said it wouldn't work, and while I liked looking at two carbs, it didn't give me noticeably more power.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.