Converting 3.3V signal to 5V with tri-state
Just use a 74HCT373 (or 54HCT373).  The HCT parts are designed to be CMOS levels out and TTL levels in -- and the TTL levels are pretty close to 3.3V CMOS.  That's basically the level-conversion technology of choice for the 1990's, when things started moving to 3.3V but there was still a lot of 5V stuff around.