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There were 383s with cast cranks
There were 383s with forged cranks.
There were 400s with cast cranks.
There were 400s with forged cranks.

Cast to cast, forged to forged, the cranks are the same. For all I know they are the same casting or forging number.

If you're using a forged crank with either 383 or 400 stock crank and rods, and neutral balance converter/harmonic damper, no need to balance.

If you're using a cast crank with either 383 or 400 stock rods and pistons, you will need the cast crank harmonic damper and converter. Then, no need to balance.

Of course, MOPAR balance jobs were the worst of the Big Three, so the stock balance jobs can definitely be improved. BUT, at this stage in your automotive development, you don't need to.

I'd pick the smaller camshaft. 383s and 400s are very easy to overcam.

R.

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