Yup, typically need to pre-fill the converter with the correct type of tranny fluid. Amount depends on converter. Refer to converter mfg for information. Make sure you've got a good cooler, as stall converters can generate more heat than stock units. Make sure that converter bolt pattern, thread pitch and hub dimensions are correct for application.

Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes