10B = build date in model year, B is second week, 10th month is Oct, 66.
MO36 is a LOS internal plant scheduling code.
765-Z = custom black buckets, Z= A50 strato buckets without headrests
2MGS = M powerglide, G console, S right rear maual antenna option U73 = all those letters in the 2 decode position, read them seperately 2M, 2G, 2S
3L is your Rally Sports package
Go up to the CRG button at the top, look under numbers --or just follow the link I posted.
You can start learning about what all those numbers mean.
Welcome to the forum!