How to break in a new fuel injected engine?

Currently the engine in my 73 scamp is destroyed.The car sat for 10 years before I got it, but water got into the engine and rusted everything together so its 318 is junk.I have a 318 that came from a 78 truck that should run sitting in my garage that I was planning on throwing in it until I can build an engine for it.The plan is a fairly hot 5.2L magnum thats been zero decked with kb167 pistons,a stout cam, and some pretty agressive headwork.Intake manifold will be a Mopar M1,and it will breath through a set of 1 3/4" long tube headers.The problem is it will be running fuel injection.I've heard that you should break in an engine how it will be driven and I plan to drive this one pretty hard.I've also heard that you should attempt to start the engine on the stock engine management and run it gently for 10 miles and a few heat cycles before getting it tuned.I dont know if the stock computer could even figure out how to fire this beast let alone run it well enough to make it 10 miles without melting a piston. Stock fuel injectors are 23-24 lbs-hour and according to an online calculator I would need atleast 31 lb injectors minimum.So what would be the best way break in the engine and get it running at least well enough to a tune on it?Should I slap on the stock keg manifold during the break in to keep the computer from commiting suicide?