X2 what Pablo said. I also had the shop install my new cam bearings. It was cheap and easier for them to do it. I pretty are I had them vat, check the block, stall cam bearings, and freeze plugs. Then I installed the short block. Took them my flywheel and balancer. They balanced everything.

Take the pistons, rods, crank, harmonic balancer and the flywheel you intend to use and have them balance the assembly.  But, tell them to NOT do any lightening or modifications to the balancer or the flywheel.  At some point, you may have to REPLACE one or both of those parts, and it is impossible to replicate any balancing without redoing the whole assembly.  Keep the harmonic balancer STOCK and the flywheel STOCK.  Balance work should be performed on crank, pistons and rods only.

But, they still need to have those items in the assembly so they can get the crank balanced properly for the components you will be using.

And for an additional tip.   Yes, have the shop install the cam bearings.  And when you start to assemble the new engine, the very first part you install on the block after chasing all the threaded holes and cleaning it thoroughly is the CAMSHAFT.  Yes, the first thing. 

Before you install the cam in the block, place the cam retainer thrust plate on the front of the cam and then bolt the timing sprocket to the camshaft and torque it to spec. Then you should be able to rotate the thrust plate freely on that assembly.  If the plate is too thick, you just found an issue you have no other way to find.  If there is too much clearance, then you need a thicker plate.  You can look it up, but I think from memory you do not want more than 0.002" clearance in there.  Use a feeler gauge to check it.  There is no other way to check this than to do it before the cam goes in the block.

Stand the block on its tail end and slide the cam into place.  Be sure it will rotate properly when held in place with the cam retainer plate.  I have had some where the cam bearings had a burr on them from installation and the cam would not rotate.  If you already installed crank and pistons, you are screwed and have to disassemble everything.  (Ask me how I know this) 

So, CAM FIRST, and only after you checked the thrust plate clearances.

If you plan to use stronger rod bolts, be sure they are in the rods when you have them balanced.  It WILL make a difference.

This is a popular post soooo you will get plenty of "advice".
When/if you get better rod bolts(a weak spot on SBF engines) have them installed and get the big end of the rod re-sized. Not real expensive and you can rev to 6000+ and not hafta worry about those rods!
I ever tell you about rotating the pistons on the rods when installing the piston pins? FREE horsepower!!
Put the notch facing the rear of the engine.
6sally6