were gonna need a ton more info.. are you adding anything, like a cam, rods, crank, pistons??? is it just a basic rebuild? have them measure the cylinders to check for wear, look at all of your bearings, look for anything broke or missing that will be easier to fix once its out of the car.
this is the stuff that i replaced because of things i was adding/changing
Cam thrust plate (because i changed out the cam)
Balancer
timing chain
Changed all the bolts out to the ARP version
Might as well check your flywheel/clutch and see if they need resurfaced or if the clutch is worn (easier to do it while the motor is out)
if you have stock motor mounts, change them out for the poly ones
put a new gasket on your oil pan (NOT CORK) use a 1 piece rubber unit
check to see if you have any leaks anywhere (water pump, timing cover etc) if your balancer doesnt have timing tape, get some, or mark it. (easier to do when motor is out, but not required)
when i get more info i can help more