Yes, me too, although I intend doing it a little bit different on ours. I don't see the need to use the Holley lower box section-the Gutsram and my modded Offy 360 dual quad both have plenty of plenum volume- so I'll be bolting a 3/8" thick ali plate to the manifolds carb mounting flanges and then bolting the Holley efi top section to the ali plate, shouldn't be any welding or machining needed.
ps, the 3/8" plate will have radiused entries into the manifold plenum/s
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