You guys are hitting some good points here. I'd run a 30 yr Ford crank
cast or steel before I'd run a Chinese POS for sure. Be careful not to get
the reciprocating weight to heavy with a 2 bolt block, Lemans rods are
heavy. I have raced a 427 with cast cranks for over 20 yrs and never
had a crankshaft problem. My 390 I ran 7000 and the 427 a little more.
I blew one up at 8500 (stupid) ,broke a rod, ruined a block, but did not
hurt the crank. I did see one in a Stock race car (Calverts 428 CJ) with a
heavy bottom end pull the block webbing and destroy everything. Very rare.
Of course with the longer crank throw on a non race motor you don't
want to turn the RPM's of the shorter arm. Good Luck with the parts. These
are definetly tough old motors.
Ron