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My guess would be low 16's....had a 66 Delta with 425 2bbl....I installed dual exhaust, wider tires, a Holley 650 spreadbore, and it would run 15:70 in the quarter. A posi would have helped....it had a 323 rear gear. Without doing things internally like HC pistons, balancing, cam, head work, the HP gain is limited and only slight increases can be made with bolt ons.....Have Fun at the Track!
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