Getting low 12's on a NA 351 is easy. I have run 10:20's in a 2500# 84 The biggest key is whatever power you get out of the motor make sure it is getting to the ground. My street car runs low 13:20's at under a 100 MPH because I get 1.8 60's on street tires.
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67 Falcon Small Block,C-6,3.25 spool, best ET to date 13.2 tore that motor down and found 3 spun rod bearings and 2 flat lobes on the cam hoping for 12's with the same setup just fresh same cam grind and all.
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