If you lost a stock crankshaft at 310 in ANY V8, you had other problems. if it was even rods at 310 rwhp, you probably had it detonate or something.
You should figure that **** out, becuase whatever blew up your stock crank is still going to be there beating the **** out of you $6000 crank...
BTW, a $6000 crank shaft swap?!?!? You can bring it to my house. Ill put a better crank in for $3000 and still feel guilty about over charging you.
Scratch that... Ill put in an entire forged rotating assembly and a 150 shot of nitrous
for you. $3000k tops