I am just having a stroker 383 built out of the original 350 from my '81 chevy 1/2 tonne truck. It is fully rollerized, 4 bolt main, edelbrock aluminum heads, chromoly rings, 150 shot of nitrous, etc. I just wanted to get some feedback on how long it will take to break in this motor and what is the best way to do so (should I vary the throttle position like breaking in a boat, run in at a continuous speed...etc) I have also heard that it would be the best to run non-synthetic 15W40 for oil and would like to get some opinions on that also. Thanks a lot.