First off Pre-Amp's are analog by definition so there is no word clock to sync too. I think what you are asking is what AD's that will sync with an external word clock.
The non-Optimod V3 has wordclock out only
The AD-1000 and 500's support WC in/out/thru (the 1000 supports syncing to many different formats on it's BNC or TOSlink in)
The Mytek 192 has WC in/out/thru
The SD USBPre2 can sync to clock on SPDIF in (so you can link multiple USBPre2's, or mix with other AD's that can sync to SPDIF)
Only the AD-1000, SD USBPre2, and V3 have a built in pre-amp.