Skip,
The gap is 1" but your bungs will have to sit on the outside of the manifold making the true distance further. The o-ring size on the pico injector is the most common size. I had the misfortune of buying conventional style injectors only to learn that they were too tall for the Torker intake. The o-ring ends fit perfectly though.
Chopper,
Summit carries both the intakes and injectors. I have always done well with Summit.
John
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1967 Firebird Convertible Factory 400/4spd
Now 462/5spd Fuel Injected
http://1967firebird.atwebpages.com/
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