your best glide speed is weight-dependent and the difference can be quite significant among the range from MTOW to an almost empty ship. i'm not 737 rated but i would assume you can find the speeds in something like a dual engine failure checklist.
glideratio on the other hand is constant (for a given configuration) and i'd guess it's at least in the higher 1/20s or maybe even above 1/30 for the MAX (clean).