u gotta account the $$$$ of labour (removing engine, taking it apart, putting back together) then add in the $$$$ of machining work of block (bore & hone). u might find ya crank is scored (screwed) hence machine that too...head maintenance (machine head).
also chemically clean engine (acid bath)
all this above doesnt include any parts wat so eva...this is wat needs to be done to rebuild an engine.
i would say that this part of the rebuild is where u will be spending most of ur $$$$
i would also recommend the use of forged pistons (arias)....the price of them these days, u would be stupid to ignore them.
if u want u could upgrade ur rods too (possibly eagle, crower)
adding the pistons and rods will stength'n engine up completely...this would provide u with a strong & reliable bottom end capable of producing high hp figures
other things u might want to consider...type of bearings, cylinder sleeves / liners, head studs (arp)
hope this helps ...i in process of gettn engine rebuilt too...it a long and lengthy process which involves lots of time and $$$$
good luck
cameron