Crank

How durable is the 440 forged crank for a 451 build? Not rehardening. Just cutting/ grinding the counterweights and taking the .125 off the mains to fit. Does it leave the mains too soft? I’m sure it’ll run. I’m interested in durability. Thanks all.
I've turned one about 6900 rpm, never had any problems. Probably made 485 hp, nothing radical, mild port job 906 heads.