They are o'k i've got one in my Malibu (377") also got one on the engine stand 406" flattops 5.565 rods, street motor, all forged both engines, i've ran them for yrs., (BAD) weak cylinder walls, i'm running 14 to 1 6"rods in the 377" and i've done that many times. My choice would be a Dart blk, but i haven't had any problems with the 400 blk.
JMO
Zip.