904-273 LA Bell housing/Torque conv/ Ring Gear questions

Hello all,

I have acquired a (I believe a 1968) 273/ 904 combo.

A few questions... are the torque converters for the 273/904 the same externally as a 318/ 340?
It seemed to be the same size as a slant 6 torque converter that I compared it to.
I have some experience with the '68 273 but it was in a stick shift car.. it used a similar clutch/ pp/ flywheel as a slant 6 which is a bit odd when compared to the other LA combos.
I was wondering if the same was the same for the 904's

Thanks for your help!