If it’s nothing but straight cuts and dissolves and you are not doing your online on an Avid product (Media Composer Adrenaline, Symphony Nitris, DS Nitris) then working in 29.97 and delivering a matchback EDL to 23.976 is OK, not great. You need to remember to be in a matchback project and know that your edit points can be +/- 1 frame at any one point.
Creating a 23.976 project will allow for more flexibility as well as accuracy in the final conform. You can still create an EDL but without the +/-1 frame adjustments but if conforming on an Avid system you can hand over the bin with the sequence or an AA sequence (if going to DS) and have conform of layers, effects, titles, etc. Audio will be easier to deal with as well if going through Pro Tools or you want to create a temp track for the conform.
Michael