318 steel crank or not?

I will have to get a pic of the banlancer and crank.I need to know if its cast or steel so I can buy the right flywheel for it.The engine came out of a 74 Valiant and my best friend rebuilt it.I am sure the crank is original to the motor.

Thanks,Jim

Jim I'll be PM'ing you in a couple minutes about when I can come up to get the 400. Maybe then I can look at your 318 and help.