360 Magnum engine

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Heres a dyno of the 380 hp create engine if that helps.
5800 is tops then for the out of box engine, wonder is it cam or head airflow holding it back?
I did the bowl work with the 1.7 rockers, maybe more? May do a little more since I now have the guide and seat machine, flow bench is in the works, need to get that finished.
Thanks for info