Need A Forged 383 Crank

I Need Advice, Heres My Build
383 Bored .30 Over
Indy Heads W/ Cnc Porting
Forged 10:1 Pistions
Mopar Purple Cam W/ .509 Lift
Mp Dual Pane Intake
Holly 750
Msd 6 Al Box
Msd Pro Billet Dist.
Tti 1 7/8" Headers

Heres My Problem Turnes Out I Have A Cast Crank, I Wanted To Run N20 On Occasion But Am Woried About The Cast Crank, Does Anyone Know A Good Sorce For One. I Would Like To Try To Find One I Could Have Machined And Dont Wany To Pay The $700 For An Eagle. I Was Also Told If Someone Had One And It Was Just Laying On The Floor It Would Warp. All Input Would Be Appriciated.

Thanks