727 help???????

no hurry but really appreciate it. ive been tryn to decode this damn thing for days. cant find anything that goes above early 80s. im puttin it behind a 360. i jst read a s.b is 7.25 and a bb is 6.50 between the top 2 bolts. sound rite? i also noticed thers a top center bolt hole in the block but nothin top center of the trans (bare w me this is my fist resto l.o.l) there is a square indent left of center on the trans. thanks for any help