If this is the first time running the motor than you should just get it close to get the rpms up and run the cams in. I think that the closer you are to 15 ATDC will allow you to get it started easier. Get the RPMs up and run it in. After that then you can drain and replace the oil then fiddle with timing etc.
In the end you will discover what is best through trial and error, remember to have it properly set, you adjust and check the timing on a warmed up engine.
The difference that it makes is if its a street car then it is best to have it idle smoothly, if its a track car then you want top end performance and idle doesn't matter as much.
Last edited by snbush67; 03-30-2018 at 12:14 PM..
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