Factory Torque-Converters ~ Stall-Rate

Can the 2801764 383 TQ be used in a small block 727?

Yes,

Just match up the 'Spline Teeth'. 1967 and up came thru with a '24-Spline'

This Converter {A-905 and A-862} was used for the
* 340
* 360
* 383 Road Runner
* 383 Super Bee
* 426 'Street Hemi' {But with an 8-Bolt Flex-Plate and '4' larger {7/16"}
Torque-Converter bolts.}