Engine planning 101

You need money.
You need a good block.
Have it sonic and magnafluxed.
Do any oiling system mods now before all the machine work.
If your going to bore it you need the pistons your going to use so they can be fitted.
If your going with new caps or main studs you will have to align bore it.
Check your deck height in case it needs decked.
Keep it clean.

adding to this.
Keep a notebook.
List the parts you already have.
List the parts you know you still need.
Keep track of prices and part numbers.