Save the 389, build the 455.
For what you and the vast majority of us do its a waste of time, effort and money to build a "stroker" when a basic 455 is more than good enough.
Once these stroker cranks showed up a lot of people thought there would be a major difference in power and reliability. There is not unless you are pushing the power level to beyond what a PMD block, any of them are safe too. And even then its not much.
A 455 with iron heads are the best street engines around considering you do not have to do much to them to get it done right.
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