to know what year your 450 has been built, just read the serial number on the back of the headstock, it should read "Cxxxxxx", the first two numbers after the C reveal the year.
the INF pickups are cheap crappy pickups made for cheap Ibanez models only. swap them with good pickups as soon as you can.
the TRS is good if you dont use the bar, dont hassle for the Floyd if you wont use it. i also suggest you to block the trem, this will help it keep in tune better, and will avoid annoying trem-angle issues during restringings.
the shims are necessary in some (many) cases, dont worry.