6.300 rods in a 416 stroker

Can 6.300 rods be used in a 340 to 416 stroker motor with a 4.00 crank stroke?

I an starting to plan my 416 stroker project and after reviewing parts I have that no once wants to buy I figured I would try to use them:

I have a set steel 4340 billet rods I bought a few years ago that measure 6.300 in length. I was told they were Callies rods, but they is ZERO manufacturer markings on these rods. I just have the rod spec sheet.

Anyway the build so far looks like such:
340 block -- eventually will get punched out - need to buy
4340 steel crank -- Eagle or Callies Dragonslayer -- need to buy
4340 Steel rods -- 6.300 length -- for a 340 crank (I have)
After market heads -- still researching

Will be looking for 500+ HP on pump gas for my pro-touring Demon...

Any thoughts on the rod length in a motor like such??

I'd sell the rods and just run shelf stuff for that power level. Scat is pretty good deal, great product and finish work. I sell K1 and Callies but for what you want the Scat internals get it done.
Brian