so my 84' gmc with the 350, and 4x4, needed a new pump. i put it on, changed out the pulley. and tried mounting it back on. i have two smaller bolts w/ 9/16" heads and a smaller one with a 1/2" head connecting the pump to the mount, and im left over with a short n long 9/16" head bolts that have no flat washer or w/e underneath like its just a hex top bolt unlike the three mounting ones. these two 9/16" hex tops can go in 3 of the holes that hold the mount to the motor, but im left over with a big bolt that won't thread into any of the holes whatsoever, anyone got a illustration or something so i can see bolt lengths/sizes?

Yes.

Maybe if you could be more specific, 85 GMC what, with or without intergral reservoir?