Most 72 340 4spds I had and I had more than one LOL came with 355's. 70 on back 323 and 391's. I had one 69 4spd with a 294. Tghat car was like and airplane. It never wound 4th gear tight it couldn't it didn't have enough power with a stock 340
i know of one '69 340 GTS, 3.23 4 speed that was clocked at 143 mph by the Ontario Provincial Police.
Don't ask how i know, but most peaked out at an indicated 135 or so.
