Jon,
This is just my opinion as an engine builder....do not start the motor until you are ready to drive the car out the door. It is impossible to properly break in a motor without getting some load on it. If I had built it, I would tell you to let it sit until you can drive it, even though I hate to see a new motor sit forever.
The only correct answer to this is to call your engine builder and do whatever he tells you. He is the one that will have to stand behind the motor if there is a problem in the future.
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Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Heavy Chevy - original owner
Team Chevelle #100
