I thought the model 4160 was a spreadbore carb? (or it would be called 4150?)
I've used a spreadbore 4160 Holley on many of my Firebirds. It is close, main problem is the center stud can't be too tall. The GP I would think has plenty of room. (Firebird hoods are really close to engine)
EDIT: I think they were 4165 models for spreadbore. Maybe look for a spreadbore Holley?
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John Wallace - johnta1
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