Whats the best time for a factory stock duster 1/4 miles ??

in 1969, i bought a 68 barracuda fastback formula S 340 4 speed with 15000 miles on it from a local Plymouth dealership mechanic who had ordered the car new. he installed hooker fender well headers, a 3:91, edelbrock aluminum "high rise" manifold, and a holley 750 dp with mechanical secondaries. with "8" slicks" and open headers, he ran low 12's consistently at a local strip (1/4 mile). i street raced the car for two years and was never beat. my barracuda outran the following cars: 66/67/68/69 396 chevelles/camaros with either 325 or 350 hp motors; 69 z/28s; 390/428 mustangs and all like engine ford products; any firebird or GTO up to the stage IV Judge motor. had a chance to run one of these cars and the cops got us. i also beat a yenko camaro one night but he couldn't get the car to move. he was a nervous type of guy and would just rev up to 5k and dump the clutch. after the tire smoke cleared i was already heading back to see where he was. any "normal" corvette was not a problem. there were no L88's or even 427 tri-power vetts where i lived.

340 really respond to headers, carbs, cams, etc. but a stock 340 4 speed duster with a 3:91 and a "good driver" should be a low 13 car - as they say - "all day long."