How long can a engine sit and still be ok?

[GMC70c20]

I have a lq4 I bought, it has been sitting on a stand in my garage for 3 years. It is complete engine with plugs in it and it spins over free by hand. I turned the engine upside down and poored oil in behind all the pistons and have left it sit for couple weeks now and the oil has ran past the rings and is now in the chambers. I bought this engine to put a different cam, heads pretty much everything be sides the crank, pistons and rods. I was planing on finally getting the parts for it and putting it together in about a month. I was going to take it down the the short block pop all the caps off then check the bearing to see how loose they are. Assuming there good shoot some assembly lube in all the bearings can put new arp fasteners in. I plan on starting it in a few months but a friend of mine said not leave it sit for very long. If I coated all the moving parts with assembly lube and primed the oil system would the engine be fine sitting for better part of a year?