You want specifics for every internal part.
Pistons:
style: flat top, dome, dished
size
material
ring type
ring position
bushed or press fit pins
valve reliefs or not
what size valves they accommodate
Pushrods:
hardened or not
size
length
cam:
every specification you can get
rods:
material
style: H or I beam
rod bolts: stock or aftermarket
crank:
material
stock size or reground
fillet radius or not
block:
bored oversize or not
how old
condition of freeze plugs
history of blown gaskets like head, timing cover, or pan
condition of timing cover
any other machine work such as clearancing for rods, if it's been decked, or if it's been align honed