727 vs. 904???

Use the one that is cheapest to get installed and running...

which is probably the 904 since you could use the /6 converter plus the driveshaft is the correct length..

remember...904 converter does in interchange with a 727 ...also the 727 is about 3.5 to 4 inches longer then the 904..there for the drive shalf would need to be shorten..