My stock cam, stock head, standard bore original '69 340 X head ran many 14.0 1/4 mile times and one time dipped into the 13s (once - think it was a tail wind). Street radials, crappy headers with dents, 2 1/4 full exhaust with some crappy mufflers, stock choke exhaust tips, 727 stock like converter, 600 Holley and 323 gears full interior. I think I used to take the spare tire and jack out of the trunk air the front tires up a little bit. Hardly the ideal drag car but it was a strong runner compared to most other "stock" engines back in the day. It could fend for itself out on the street fairly well and no problem doing smoky burn outs.