Question about 727 spline count

[Matt13]

1973 Plymouth Barracuda. Originally a 318 car. My question is, should I have a 24 or 19 spline 727? Is there one count that is typically in a '73 Barracuda? Trying to buy a new Converter and need to know the spline count hopefully without having to drop the trans.

[71GranCoupe]

If possible, share the stamped numbers of the trans. On an older car, it is possible it is not the original and may have been changed.

[chargerdon]

make sure its even a 727.   Typically a 318 e-body car came with a 904 auto.   check the numbers on the side of the transmission right above the pan.