[casperGSR]

I'm assuming you're going forced induction if you're wanting to do a buildup... in which case here are my suggestions for parts:
je pistons
crower or eagle rods
crower valve springs and titanium retainers
skunk2 cam gears
keep your stock cam shafts and valves

You can also port and polish the head and if you wanted to resleeve the block. If you're looking for more then just this you should do a search on internal buildups, the discussion has been brought up numerous times.