I have the offy 4 barrel intake and the carb studs are just long enough now, but I plan to add an insulator fiber plate under the carb and the studs will be to short. They are 5/16 fine thread on one end and course on the other.
Humm, I might be able to pull them out of the spare engines manifold to head connection.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Dorman sell 5/16" coarse-by-fine studs in multiple lengths.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Hardware store, or industrial supply store. I have a independent hardware store near me that has a great stock of nut, bolts, and studs. Also a supply house in Ocala, where I buy items like that, by the box. What length do you need?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I just get a piece of 5/16" all thread and make them any length I need.

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Official Cookie and Mater Tormentor.

I need 3" ones.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir