360/904 B&M flexplate

swinger 74 said

Ok I thought the 318 904 TQ was neutrally balanced do to the 318 being internally balanced.

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Yes, your 318 should have a neutral balanced converter (no weights).
Crazier stuff has happened. Just make sure the balancer has no weights, and use the B&M flexplate.
Check that your harmonic balancer is in good condition.