904 tourqe converter question.

cosgig said

And the spline count needs to match the trans. Early 904’s have a unique spline count, 19 I think, and they will only work with compatible converters.

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tourqueflight 904 tourqe convter body 1966 Plymouth Barracuda Base 4.5L

the CY9-8-SP could be anything. i'd assume 9 for 904 and SP for special? but that's just WAG

anyway, more important is that the snout of the converter matches the crank register of the 273
The OD is 1.560 crank end of 273 tourque converter mounted onto flex plate.
318 is a larger OD
This not a mentioned dimention when ordering a new one from Jets or Rock auto.