Let’s hear a 340 story
My first 70 duster 340 ran consistent 14.2 when it was new and had 3.91 rearend. I started with all the easy stuff like Heddman hustler headers, slicks and 4.56 rear still smoked tires bad coming off the line until I put traction bars on it. It was then running 12.5s and still very streetable I ran it mostly at Keystone and and sometimes (not often) at PID. I blew a piston at Quaker City in Salem ,OH and pulled the motor and took it to Broughers speed shop and had it bored .060 over and a lot of head work, tarantula intake 850 holly, solid lifters, Lakewood scatter shield, Zoom clutch and 5.13 gears. It then was running 11.2's at Keystone but after a couple of passes it would blow head gaskets With the Trw 12 and a half pistons and head work it had over 13 to one compression . It was not streetable would shut off if the idle was set below 2200 rpms. At the track I launched at 5500 Rpms and shifted at 8000 and came through the traps pretty close to that.End of the story I sold the running gear and put a 318 automatic in it from a wrecked 67 Dodge coronet RT put the 340 exhaust manifolds and 3.55 gears in run great that way but by then I was married and had a 2 year old baby that needed glasses and such so I sold it in I believe 1976 or 7 to a guy I worked with in the auto center at JCPenney's in Monroeville,PA for 200 dollars and a paint job he did on a 70 Cutlass that my wife had. Great memories from back then!